3spd to TH400 swap questions(shortbed)

[super-k]

I`m looking for input from people that have done this swap.I know the choices,but haven`t decided on a direction to take.I`m considering staying with the 1pc driveshaft and having it made longer.I don`t want to move the engine back for two reasons:1)speedo cable length problems 2)linkage length problems(needs to be custom-made or made from 4wd linkage).The other option would be install 2pc driveshaft either from another shortbed(hard to find) or shorten both shafts from longbed(I have).Not to mention installing carrier bearing.I`m making this swap with two complete vehicles:`71C/20,350,TH400,P/S,P/B and a`72 C/10 SWB,250,3spd.The SWB will be getting a 4/6 drop from Early Classic.I think this will put the trans and rear more in line and centered in slot in crossmember,lessening the need for 2pc driveshaft.Any comments appreciated.