Mike has been known to frequent my shop, which is why a lot of parts seem to leave here with him LOL! Mike, if fuel is not a big concern why not crank the compression up to 13:1 or so? That engine sounds a lot like my 511" Drag Week engine, which made a bit over 700 HP with 12.5:1, and was street drivable on pump premium fuel. I just put race gas in for the track.