Do you find yourself in the awkward position of liking large displacement V-Twins, but you're NOT a dirtbag, or a racer-boy wannabe??   That certainly limits your options; it means:

This doesn't leave much: Older desmodromic and bevel-driven cam Ducatis, and the chain-drive XV920R Yamahas of the early '80s.   We'll start with one of those.

Project Silverback