360 heads on a LA 318 vs Magnum heads on a LA 318

I have a 1988 Roller block with magnum heads the motor runs really strong, i went from 302 heads to magnum heads i pulled at the junkyard and holy **** i picked up some Balls. Plus that 1.6 rocker ratio added lift to my camshaft. It pulls to 6k very easy and quick im running the stock springs as well. 264/266 duration with 0.453/.437 regrind