cole for the money the two most powerful engines i have ran are the lrp .30 and picco p3 .28. Both engines are animals....tons of torque and top end speed. Easy to tune and just all around good engines. Nos is another that is just not really worth the money paid either....gain "can" be made with nos but not worth the beating the engine takes. I have a lrp .30 in my savage currently and i love it. If you want the all out most powerful engine there is have ercm on this site mod a picco for you. That is about the most power you will get out of a big block engine.