Thanks for the info. I was hoping that it was an od tranny. It was if fact a 409 (only reason I bought it). I checked the block and head numbers and there was even an engine option tag(metal)on the drivers side door jamb. It was a cab over.
What I'm working on now is a '67 One ton GMC 351 E, was a factory rv, 77k original miles. Orange, factory buckets, speedminder. Haven't had it long. Did get the camper off and making plans for a flatbed soon. Wanted an overdrive tranny for it. What would be another good option for a manual tranny? Wheelbase is 157" is that standard for one tons? Will have pictures soon. Because everyone loves pictures! Thanks again for the info.