critique this Magnum hop up, swap.

Sounds like a torquey little mill! Magnum's sure aren't race heads, but I feel they are a great way to pick up comp and port velocity. Never hurts to do some pocket porting under the valve heads. Keep in mind the magnum exhaust port works much better than an la head,so getting more intake flow will help. Keep it reasonable, and port velocity will stay up. Between the thin gaskets and the magnums, comp might be as high as 9.5:1. Depends how far down your piston is, and how big it's dish.