I found a facebook marketplace ad for a Mel Kenyon V8. It's a crank and crankcase that takes gs1100 cylinders and heads using a new scat crankshaft. It includes a previous broken engine to provide machining information It's on for $5500 and I'm amazed at the possibilities. I remember that name from circle track racing. If there were no prior projects in my shop and a full checking account I'd have to own it.
A single stock GS1100 is around a hundred HP, a v8 would be a serious beast if a guy could fit it into a bike. I'm unsure of what clutch and assume a dry sump oiling system but a Harley trans might work. Even inline like a BossHoss with a torque converter.