Stopping the knock: Lower compression and ported heads...

to the thread owner:

2 things.

1. please please please verify no vacuum leaks. this means getting the documentation for your carb and knowing exactly what each and every vacuum connection is, what is is for, what you should use, what you are not using, what should be capped off if not used.

2. here is a pdf file. click on instructions about 2/3 way down. on the instructions tab you will see a link for a pdf you can view. (RRR dont go here. i know you dont like msd). it's instructions for installing a distributor that has ample explanations of advance curves, springs etc. study how it all works. understand what is meant by limiting total advance, setting initial advance, and how the springs can be changed to slow down or speed up when you are "all in"
http://www.msdignition.com/Products...hrysler_383-400_Ready_to_Run_Distributor.aspx

i'd also recommend visiting other sites or getting a book about distributor curves etc.