in my 12 years experience, my opinion now days is f**k it.. get a good stock motor and put quality supporting mods on it and quality tuning with e85 and make good strong reliable power. ive built motor and blown them up, due to the silly little things that can go wrong, so financially im better off running an OEM motor with mods.
my car is proof of that, stock RB30 with 26 head, all supporting mods. 412 rwkw on 22 psi and it gets thrashed...HARD