Not sure how big your looking to go but a friend of mine runs that 290 marine cam by comp and it runs pretty good. He had it in a stock 455 in a Rogers Cyclone. Our boats use to run dead even. I added dual carbs and can now outrun him. He is now building a 600-700 hp bbc so he says. He's a jet boat rookie so i think i'll still beat him.
I had my heads off for a broken valve spring and found cracks in them so im buying edelbrocks in a couple of weeks.