R-3 358 Maurice Petty and Associates Engine?

I have one in my 1970 Cuda backhalf car. Wanting to know more about these motors. I hear they are big horsepower and bullet proof. Who can tell me more?? It has the 4 sump oil system and the big Brodix Heads. This is one of the real motors - they didn't have a intake that would run correct on these motors so they took a victor intake and modified it. Can anyone tell me about these motor's and there stats?