4-Speed Swap Donar Car Question

4-speed; Any year A833, with a 1x23 input and short- tail. There are 3 ratios in the non-od boxes, plus one in the od, but with two od ratios.The long tail can be made to fit fairly easily, and offers the possibility of moving the shifter back between the buckets; no more reaching. you will need to make the custom mount and shifter rods. I really like mine back there and high mounted and with a short stick.
For a 340, I recommend the Commando-box; 3.09-1.92-1.40-1.00 ..
I recommend to shy away from the od boxes, especially the one with the 18tooth od gear, which will shatter if you forget that it is just for cruising with; which is very easy to do with 3.91s or better in the rear. The 21t is slightly stronger but will not endure the same treatment.
3-speed; any A-230 full-synchro, AFAIK there is just one ratio
bellhouse; 67 to 72 SBM only,Others will fit but the inboard z-bar anchor may give you trouble.
Shifter; with bucket seats;any
Shifter handle;with bucket seats I think anything will fit; some better than others. But with a bench; any A-body 67 up, A-body only. The difference is in the handle, and how it gets to your hand/palm..
Pedal box;67 to 72
the rest; any SBM, 67 up, I think
Driveshaft; is body/rear-end/trans specific; there being a multitude of lengths, as to wheelbases, tail lengths,and rear ends. You might as well figure on going custom, unless your donor happens to be identical to what you have.

I think I could scare up everything you need except the floor-hump. By the time it gets to your door tho, it wouldn't be cheap.