I had that combo (255-260 HP at wheels)
Crower 60240 is a smooth running cam but hard to dial in. I had to advance that cam 2 times to get any performance out of mine on a 389 (first 4 degrees and then 6 degrees advanced was just right).
It's strange because the cam supposedly comes with 4 degrees dialed in but if you go dot to dot it will be a dog. Must degree it on a wheel to verify.
You'll get 255-260 HP at the wheels with that cam, all done making power at 4800-5000 (but revs higher no problem). It makes about 325 HP at the flywheel x 20% loss or about 260....your compression ratio looks to be about 8.5:1 which is fine with that cam (and will run w/ no detonation worries on 87 or 89 all day long). I had 90cc small valve #11 heads and made decent power. Its a driver cam.
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1974 Lemans Sportecoupe GT (daily driver)
.030 over 354, #47 heads (84cc), Lunati voodoo 700 camshaft (207/213 @ .050), logs, 2.5 duals, X-pipe and Dynomax super turbo mufflers, 3.08 rear
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