55.2-59 several saginaw and bellhousing related questions for my 59

[stackz]

ok, so I'm always looking online for parts deals.

already have a 76 014 2bolt running 350 for my 59 apache. been wanting to keep it stickshift and came across a guy advertising 2 3 speed saginaws with bellhousings and linkage, etc for $300 locally. I went and grabbed them and it turns out one was a 4 speed.

the bellhousings are both for small blocks.

the orange one with side mounts is a part number 3733365. internet shows 10.5" or 11" clutch and 168 tooth flywheel.
https://www.ebay.com/itm/27249463346...Bk9SR5TWwbe_ZQ

the aluminum one is part number 3858403. internet shows 10.5" clutch and 153 tooth flywheel.
https://www.ebay.com/itm/37594023258...Bk9SR87dyLe_ZQ

I have read both ways that the 365 will or will not fit trucks. thoughts? which would you run if you had both? its weird that one has a smaller flywheel but runs the same size clutch?? I have no clue which one to choose?

as for the 3 and 4 speed saginaw, I'm having pinning down what they came from?

I've had a vega 4 speed before and I have seen in person the 3 rings on them. this one has a vega shifter but either has no rings or it has a ring...but its not on the splines. it also seems to either be a 1966 or 1976 model. I have no clue. I cant figure out the partial VIN on it and I didnt think vegas came with a no ring transmission as they needed the numerically higher 1st for the underpowered 4 banger they came with...

partial vin on it is (I think) 16U166431 and the case stamp is R6T22 (dec 22, 1966 or dec 22, 1976).

the 3 speed I have no clue how to decifer the case stamp is it simply S0707. no letter for month in it. I'm adding pics for help.

I basically want to keep one of the bellhousings to use, keep the 3 speed saginaw so I can keep my 3 on the tree (just adapt linkage for it), and sell everything else I do not need. I just do not want to mis-represent the 4 speed as something it is not and I dont want to keep a bellhousing I cant use/need.