904 Mash up

Alecb said

I'm collecting parts to swap a 360 into my 73 Duster, one of those parts is a small block transmission. I found a 904 from the 60s that is allegedly a performance transmission. The main issue is that it has a fixed yoke at the back. Could I take the tail shaft and other interior components from the 904 that is behind my slant six and combine them with the small block 904 to create a small block, slip yoke, 904 transmission?
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A bunch of issues here.
1.) The ball & trunion tailshaft, as you've already noticed...
2.) It's a '65 & earlier trans, so it has the cable shift mechanisms and valve body.
3.) It has the early input shaft which limits you to early convertors, which means later convertors will not interchange.
4.) The early convertors use a smaller nose which will require an adapter bushing into your 360 crank register.
5.) No off-the-shelf performance convertors available, only custom builds; limited number of suppliers that can/will build one for you... $$.
By the time you find, switch, & convert everything over to suit your '73/360 combo, you will be time and money ahead to just find the right trans to begin with.