360 head porting for big power (500HP ?)

I got valves with the heads but nothing else. So I need to figure out which springs/retainers to go with. Gonna be going on a .030 over 360 with stock stroke. 10.16:1 compression and a Mopar .528 solid cam and 273 adjustable rockers. Not really using them to this full potential, but this 360 should rip.

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