At a crossroads, SB guys please chime in.

The short deck version R3's are around and can be found in 48 and 59 deg. They will handle 1000hp easy. Now for the hard part. They are not cheap or easy builds for the average Joe. If you go that route I have a short deck boosted rotating assembly I'd be willing to let go. Currently building a new N/A engine with maybe a wee 250 shot or so...