Looks like the rockers are stainless rollers. I'd use them if they're smooth and tight. The Edelbrock top end would suit your combo well.
If I'm a betting man, based on what you got from the previous owner and the parting lines I see on them, those are the Crane silver rockers - which are ABSOLUTE GARBAGE (in my personal experience); you'd get more power out of those by selling them for scrap metal value. This is going to sound harsh and overboard, but I personally would use a stamped GM rocker over those things...
(Ok, maybe not, but it would be close.)
There's plenty of other good rocker options out there given a little bit of web searching and archive searching here. Your thought on the Edelbrock route isn't bad either for what your budget sounds like.