Well, I can tell you that Holley carbs of that era tend to
be very intolerant of backfires. There's a part of the
carb called a "power valve" which takes care of enrichment
after the accelerator pump shot is consumed. The rubber
diaphragm in that valve tends to be easily damaged by as
few as one or two backfires out the carb throat.

Best bet is to throw an overhaul kit into it.

JazzMan

How did you clean the jets?  If you poked anything through them besides a
shot of carb cleaner...they are most likely toast.

great meatballs, is to use very lean meat.

1 lb. ground flesh; human or pork
3 lb. ground beef
1 cup finely chopped onions
7 - 12 cloves garlic
1 cup seasoned bread crumbs
? cup milk, 2 eggs
Oregano
basil
salt
pepper
Italian seasoning, etc.
Tomato gravy (see index)
Fresh or at least freshly cooked spaghetti or other pasta

Mix the ground meats together in a large bowl,
  then mix each of the other ingredients.
Make balls about the size of a baby?s fist
  (there should be one lying around for reference).
Bake at 400?for about 25 minutes -
  or you could fry them in olive oil.
Place the meatballs in the tomato gravy, and simmer for several hours.
Serve on spaghetti.
Accompany with green salad, garlic bread and red wine.

Newborn Parmesan

This classic Sicilian cuisine can easily be turned into Eggplant Parmesan
If you are planning a vegetarian meal. Or you could just as well use veal -
after all, you have to be careful - Sicilians are touchy about their young
family members...

6 newborn or v

Brown the onions, peppers and celery.
Add the meat then season, continue browning.
De-glaze with sherry, add the reduced broth.
Finally, put in the root vegetables and simmer for 15 minutes.
Allow to cool slightly.
Place the pie pan in 375 degree oven for a few minutes so bottom crust is not soggy,
  reduce oven to 325.
Fill the pie with stew, place top crust and with a fork, seal the crusts together
  then poke holes in top.
Return to oven and bake for 30 minutes, or until pie crust is golden brown.

Sudden Infant Death Soup

SIDS: delicious in winter, comparable to old fashioned Beef and Vegetable Soup.
Its free, you can sell the crib, baby clothes, toys, stroller... and so easy to
procure if such a lucky find is at hand (just pick him up from the crib and
he?s good to go)!

SIDS victim, cleaned
? cup cooking oil
Carrots
onions
broccoli
whole cabbage
fresh green beans
potato
turnip
celery
tomato
? stick butter
1 cup cooked pasta (macaroni, shells, etc.)

Rem

white rice.

Pre-mie Pot Pie

When working with prematurely delivered newborns (or chicken) use sherry;
red wine with beef (buy steak or roast, do not pre-boil).

Pie crust (see index)
Whole fresh pre-mie; eviscerated, head, hands and feet removed
Onions, bell pepper, celery
? cup wine
Root vegetables of choice (turnips, carrots, potatoes, etc) cubed

Make a crust from scratch - or go shamefully to the frozen food section
  of your favorite grocery and select 2 high quality pie crusts (you
  will need one for the top also).
Boil the prepared delicacy until the meat starts to come off the bones.
Remove, de-bone and cube; continue to reduce the broth.
Brown the onions, peppers and celery.
Add the meat then season, continue browning.
De-glaze with sherry, add the reduced broth.
Finally, put in the root vegetables and simmer for 15 minutes.
Allow to cool slightly.
Place the pie pan in 375 degree oven for a few minutes so bottom crust is not soggy,
  reduce oven to 325.
Fill the pie with stew, place top crust and with a fork, seal the crusts together
  then poke holes in top.
Return to oven and bake for 30 minutes, or until pie crust is golden brown.

Sudden Infant Death Soup

SIDS: delicious in w

look at the power jet, the one with a diaphraghm.
they go bad in time and especially after some backfires.
good luck, sam