I have a mismatched set of "587" and "915" 360 heads under the bench in my garage I practically can't give away...they came on the 360 I bought, which I switched to magnums because of the 8:1 pistons.

I can tell you one thing, I have some magnum heads that i literally just pulled off a '96 ram van and installed the r/t springs, bolted them on with the right stuff and the thing runs ridiculous....It probably easily makes 350hp with a Summit K6901 cam (small!!!) and an Edelbrock Air Gap on a 360.