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I have a 1965 289 with a C4 transmission. both are new rebuilds. engine runs great but when I put the car in gear it dies. even with the idle kind of high it dies. is this a vacuum issue? if it is where can I find the line that is the problem? thanks
 

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Most likely the one going to the modulator valve. However, I would diconnect and plug one at a time and see if this solves the problem.

There are several things that could cause this. This should eliminate it if the vacumn is causing this problem. My 289 does this when it is cold, but I believe it just the nature of the beast.
 

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Could be a possible of couple things .. What does your tack read when your idling in park ? happened to a old truck i had, my truck was doing that ... never realized it was leaking tran fluid .. had none. It would start, when in drive it would die.
 
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