You are kinda answering your own question. You have a miss match engine combo w/ low comp and large heads big cam which is killing the runner velocity which, as mentioned, your not pulling air on the bottom end and getting a poor carb signal. Your clean pass shows you can mask the problem. As mentioned above a wide band tuning and the aid of a down track recorder tells you exactly whats happening
and where (no guessing)
GBodyForum is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates.