[demian5]

Yes you rambled quite a bit...

Bad choke? Adjusted too high?
Ive seen what look like cracks where you mention. How about some pictures?

I ran a small block Q-jet on a 468 with a decent size crower power beast cam, big oval corvette heads, roller rockers, hooker long tubes and about 12 degrees of initial timing. Ran like a raped ape and passed everything bu a gas station (which is why i no longer have it)...

All I changed was the main jet metering rods.

The 4-digit number on the side of the carb will get you a new kit.

But post some pictures.