switch from auto to sm465??

[stan79chevy]

Heres what i have
350 engine --350-400 hp
th350 tranny--dead
203 transfer case--3/4 dead
1/2 ton axles--soon to be dead
parts i have
complete truck with 3 on the tree, 205 transfer case, and 3/4 ton axles 10 bolt front and 14 rear with 4.56 ratio

??'s
i want sm465/205 with 3/4 ton axles when im finished
will that 205 case fit or do i have to find one from a 4 speed? any adapters or anything else needed. is a 3 speed the same size as a 4 speed?..so i can use the driveshafts from the donor truck..

i paid 200 for the donor truck and was planning on just using the axles until my automatic tranny dies so now im going manual i just need to know what all i will have to buy sell or trade to get this into my truck..i cna take the clutch pedals out of the manual truck and put into the auto right? if anyone has any advice or info on doing this it would be helpful i want to get all the parts rounded up and then put it all together in a weekend..

thanks
stan