these web sites help me alot should be what you need to know http://www.mortec.com/bbc.htm
and if you want to make big power
most bang for the buck http://www.procharger.com/marine.shtml
heres the breakdown http://www.procharger.com/M_engine.shtml
also http://www.keitheickert.com/products/Superchargers/procharger-carbureted-kits.htm