Help me sort my combo

First question...... which 509 cam?
There are two...... 108lsa or 114lsa.

The 114 would be “better” than the 108 for ex manifolds, but neither are really a good choice for that combo imo.

If what you’re really after is “more power”, put headers on it.

If you want more power and still have really nice street manners, put headers on it and a solid flat tappet cam.

If you’d be happy with better response and low end grunt....... put headers on it and a smaller cam.

If you really want to keep the ex manifolds, I’d put a smaller cam in it...... which would offer better response and drivability...... but would do little to actually increase the amount of HP.