I b'lieve I've seen a book on "hot rodding" these old Stovebolt engines. For the price of around $20-$30 (used vs. new?)it might be worth the investment to read about what can really be done to achieve more HP. There HAS to have been ton's of previous discussions on this subject in the past?
Edit: Found it. Chevrolet Inline Six Cylindar Power Manual $29.95 at Classic parts. I'm sure other purveyors of parts like Am. classic might have the book as well. You can begin by making sure your manifolds line up properly and minimize any obstructions, etc. The comments on this book says it has blueprints, airflow charts etc. Sounds kind of high tech if you just want a Daily Driver? I remember pulling some mightly loads with my Dad's 3/4 t. 52, 4 spd.

Last edited by Nifty53; 08/24/2012 11:37 PM.