I don't know of a site, but I do know that RMR Designs has many 1/16 scale parts because I've bought a few. Ron makes engines, bodies, wheels, rear end differentials, tires, a Daytona wing kit, Drag Star Wheels, ................
I've bought a Ford 427 D.O.H.C. engine, '32 Ford grille shell, front wheels for funny car, 'T' bucket body for an altered drag racer with a wing and 'T' track nose, Dana rear end, the Daytona conversion kit for the Dukes of Hazzard Charger, and I'm sure something else that I've forgotten about.
You can contact him here,
Ron Andrews
11445 Port Ave.
Meadville, PA 16335
Ph# 814-337-4250
ra1_16@hotmail.com
Tell him MojoDoctor sent ya!