Lawrie, I have to agree, those little 21 stud, 221 engines are awesome little runners. I found this out last year on the 7200 mile cross country tour. My '35 Fordor had no problems keeping up with the big dogs running there later FH's.
You probably should think about building a little hodrod to use that 99a engine
. Maybe something for Carol so she won't be too upset about spending all that money on the engine.