Slant 6 and 318 trans options

I’m searched this site too to bottom and no one spells it’s our clearly what the transmissions are called . I need actual numbers to buy a new one or look at swaps . How many options are there and what are they actually called

What I want is to remove my slant 6 motor and 3 on tree transmission ( don’t know what it’s called and can’t find ) and put in a 318 but a 3 on the tree trans option still ( can’t find what that trans would be either )


1970 duster

slant 6 auto =904
Slant 6 3speed manual on floor ?
Slant 6 3speed manual on tree ?

318 - auto =904 but with different casting ?
318 - auto = 727 ?
318 - 3 speed manual on floor ?
318 - 3 speed manual on tree ?