The only stock motor I have is the 270, the rest are all mixed matched.. but I'm pretty sure that if the G506 4 speed bolts up, then the CCKW 5 speed should. I have a 58 235 with a civvy motor and bell housing (by cast in part number)that will fit a G506 tranny, so that should also take a CCKW 5 speed.
Now if it will match the frame/linkages is another matter. The 5speed is HUGE compared to the 4... so while the bolt pattern may fit, the actual transmission fitting may not.
Its to cold in the garage to make 10000% sure, but if it gets warm I may set one up just to show the sizes.
