Here's what I used to play with...
Under all of that is a Dart aluminum block stuffed with a lot of billet and forged goodies topped with a Turbonetics T3/4 hybrid. Only thing "automotive" is the LT1 intake which we used because of it's low clearance.
I put them in these (this happens to be my fathers)...
When you use the right parts, take your time to get all of your tolerances just right, and get your tune right, you can make lots of power for a long time. Your average street car dragster might make 450-500 hp for a 12 second blast. These engines run at 510 hp for hours on end without so much as a hiccup. It's all in the parts and BMEP. Get it right and it'll last a loooong time making as much power as you want.