Hi Russell,
Lew McFarland was using a Veco 45 in his Shark at one time. IIRC, RSM has a kit of the Shark. It is a great flying plane! The trike gear is fun, too.
A UHP Imitation should work with the Veco or Fox 45, also.
I have a Veco 45 and 50. Basically the same engines except the 50 is ringed. Both are great runners, they were just a touch heavy for the time versus some of the other engines. The 45 found its way into several stunters of the early-mid '60s. Bob Palmer's Skyscraper and Bob Gialdidni's Eclipse to name a couple more. When the ST 46 came out, they kinda disappeared since the ST was a good bit lighter. The Veco was a very good engine, much smoother running than the K&B 45.
Ted Snow's Humongous Is an OTS candidate that I *think* a Veco 45 would work well in! (just thought of that one.) RSM kits that, too, IIRC. If you care to "plans (scratch) build" a plane, Don Still's Victory (long tail version) from Flying Models would be another candidate.
Bill <><