Hi Jim,
For some reason, I like Tom's 3 1/2" bellcranks in the "standard Fox .35 size" Classic plane.
I found it interesting when a couple weeks ago, Kent Tysor flew my "restored" Charles Parrott P-47. A pretty good sized "35 Classic". I built it in '94, flew it in Classic for a year or so with a Fox 35. Not enough engine, so I left it alone until a little over a year ago. When I built it, I used a 3" Sig nylon BC, and some Top Flite horns I had. It is now about 4 oz. lighter, and has a T&L McCoy 40 in it.
Anyway, after Kent flew it, he remarked that he just couldn't fly it himself on a regular basis. The controls were just too fast! I was used to it, so it didn't bother me.............. but everything I have built of a serious nature in the past 10 years has had at least a 3 1/2" BC and "modern horns".