I've got a '86 roller 318 that I just put in my 5th ave (original engine to the car). I put on some home ported magnum heads with a fresh valve job. honed the cyls with new moly rings (pistons measured .055 in the hole), used the thin Mr. gasket head gaskets. compression should be 9.04:1 (assuming 64cc comb. chambers, didn't get a chance to measure them). I had the broomstick of a roller cam (stock is ~240 adv, ~.373" lift) reground by bullet cams to 259 adv/208 .050/127@.2" and .316" lobe lift (.506" lift with mag rockers) on the factory 112LSA/108 ICL. I'm using used magnum lifters, and hughes 1110 springs with 2.2L chrysler retainers. intake is an LA RPM air gap (I redrilled the heads), carb is a 600 eddie. I should have it fired up this weekend. using a comp XR258HR (similar intake lobe) in compcams camquest is predicting 365-380hp/410 tq, which I think is a little optimistic, switching to an HE252 hydraulic flat tappet it's predicting ~340hp/390 tq, which I think is reasonable, and would be comparable to a stock 5.7 hemi for power.....

I personally think 300HP out of a 318 mag w/a stock cam is a little optimistic unless you have a happy dyno, 310-320 is possible from a stock 360 mag, as it uses essentially the same cam as the 300HP crate motor. the 318 cam as slightly more lift, but significantly less (~12 degrees) duration.

but it's ~$150+ ship both ways (~$30 total) to get the cam reground by bullet.