how much cam with performer rpm heads?

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For my combo, 11.5 TRW's, (ha ha!) 906s at 88 cc's, roughly .050 down the hole, I've got around 10.5 to one. It'll run on pump 91, but I sweeten with 100LL Avgas, cause I can
The swap to 75cc rpm's will bump the compression 1.25 points, so an avgas mix will become mandatory. I'm running a .557 purple shaft so I can do an A-B head swap test. With sloppy factory adjustable rocker ratio and lash, if it's really moving the valves .525 I'll be surprised.
Edit: forgot to mention, a 440.
 
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