I believe that it is an urban legend that Toyota built the engine using a GM license. It appears that they copied the 235 which was being replaced by the next series GM engines. Nothing fits from the 235 (or any other GM engine) to the 2F. I have worked on a few of them and they are OK. However, I would sell the engine to a Toyota guy and buy a GM engine.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine