Here is your home work. Read it know it, there will be a test.
You wont make 550hp with the ported 305 heads, but you will make well over 400hp
if you do them right. you got to lean on that die grinder thou.
Chevrolet Small Block - Engine Buildup - Tunnel Ram, Nitrous - Hot Rod
Lock out the distributor advance curve 36deg BTDC locked full time.
Champion RV8C plugs .035" in the 305 heads.