Darren, If you are open, I have a simple crazy idea, YOU could buy Don Johnston's 455ci. Pump Gas DCI Ram Air V engine that makes at least 650hp and has been engineered out and runs and runs well. Check out his video on Youtube, very impressive for sure. That engine could go into your street car very quickly and you can enjoy it!! THEN if you want to build a VERY High End Race engine with DCI Ram Air V heads on it you can go to a professional engine builder and sit down and make a plan that will fulfill your Race Car Goals with reliability.
Darren then you will have fun with BOTH of your Cool cars!!