Originally Posted by blancojp
I already checked all of that but the problem has not gone away.
1) I replaced the distributor three times, double checking the weights and the mechanicals to make sure it was OK.
2) I also deleted and added gaskets, including a 10mm spacer I had for the other engine.
3) I replaced the intake manifold just in case it was cracked.
The problem is still there no matter what I do. My next step is to install a 32/36 Ford/Webber/Holley I have in house to see what the reaction is. I will however be installing the carb backwards due to the manifold requirements.
If this does not cure the problem then it will be time to yank out the engine and use one of the other motors I have in stock.
Interesting how something so simple can be complicated at times.
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Changing an engine because of a 400rpm hesitation on return to idle sounds a little drastic, especially when you finally discover a small hole in the diaphram of your brake booster.