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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.

they are vertually the same heads with different casting number. 915 used through 72 abd the 587 in 73 for a couple of years. No real difference. You would never tell the difference using them together.