Block girdles, yay or nay

Run stock caps and studs. Done. If you want a different cap, then OK, not really necessary.

Keeping that engine out of detonation is going to be the goal. Bad tune ups hurt parts!
This is my take also, but my build will never exceed 550 horsepower after that I could see going with an improved cap but I'm not sold on four bolt mains for small block Mopar.