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I don't feel your timing change will help and if the carb setup does
anything much I'd be surprised but it sure can't hurt to have it setup
on a flow bench. Remember that today's fuel is going to have some
effect on how well your carburetor can be tuned just due to the age of
its design. One thing I noticed on my '64 is the heavy soot that is
left in the carbon channels in the manifold and the choke tube system.
Although that shouldn't affect the way the carburetor works it tells
me it is reacting to the older design different that it use to with
the fuel of the sixties.

Straight 20 weight non detergent and work it, don't beat it, just give
the rings enough drive time that they have a chance to conform to the
cylinders finish.

During our last club outing I followed a '77 that has a total rebuild
on the stock block without a rebore, also a '62 that was bored at
rebuild and both put out a puff of smoke, black, when shifted and hard
acceleration. Nothing major so I ask one of them if my '64 did that as
I couldn't see it and they said, yes, but very slight. My oil usage
for 1,000 miles doesn't show up on the stick, just a drip on the floor
after driving it. A Z06 did about the same thing but I expect that
from any manual transmission equipped vehicle even the newer designs
and also the smaller engines.

I don't believe there was a re-bore done, I don't remember him saying
the pistons were replaced. My guess would be a hone job to break the
glaze and give the rings some bite to seat them.

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Most likely, and he has the added problem that it was done a long way
from where it is now. He may need to see Judge Judy.

Hey Dad, The gentleman who re-timed it also does smog tests. He hooked it up
to his analyzer, did the readings, before and after he re-set timing and
showed no change. He said that in his estimation that it should be closer to
3%. He said that perhaps gasses were being  trapped in the mufflers and
expelled under acceleration. I respect your opinion/ best guess about this
not being the root of the problem. I have my own doubts, but am hoping we
are both guessing wrong. I just returned from dropping off the carb. at the
shop. The gentleman there did a quick look-over and said he was very sure
that the carb is serviceable, and not toast. I gave him all the info he
requested and was pleased that the metal tag was still on the body.
Depending on what parts may need to be replaced, he said some parts for a
WCFB are more difficult to locate. He had a reasonably clean, but
cluttered,shop full of carbs. in different stages of repair. He appeared to
be interested in working on it so we will see how it all plays out- lib