So your saying I should just use the 305 intake manifold then? The 307 is
probably worth more on eBay anyway$ :-)

Then the question; should I also get my 305's quadra jet running right and
ditch the holly 2b on the chevelle? I'm thinkin I should ... put the $24.00
into a rebuild kit and see how it goes. Probably get it runnin on the 2bbl
first just since I've never done something like this before. Hey will the
holly 2bbl bolt onto the 305 intake? I would assume yes. Chevy got the
interchangeability under the hood _so_ right. Transmissions to transfer
cases are a different story, Ford & Dodge are good there so I'm told. But
then ford & their engine-to-transmission nightmares......

GMC Gremlin

305 heads are notorious for being crap.  They are very light castings
and more likely than not will show cracks if you mangaflux them since
they are 20 years old.  Not sure what cc combustion chamber Chevy used
with the 307, probably 62 or 64 cc.

As the owner of a Chevelle I believe it deserves better than a used
set of 305 heads.  Spend a little on a new set.  Unlike most every
thing else you own your Chevelle is worth more every day you own it.

The distributor will not work.  85?s have a partial computer control
and the distro will have an extra plug that won?t connect to anything
on your Chevelle.  (Believe me, I tried with an 83 distro from a
pickup).  The pushrods will work, unless you?re working with something
really odd, all the small block pushrods are the same.  Check them for
straightness, though.