stickshifted

so i have a 1967 dodge d200 crewcab longbed that was converted to 4x4 using a 71 chevy k20 disk brake dana 44 and a divorced np-201 transfer case. with a '71 360 engine in it.

and i have the np435 transmission and theres a small driveshaft in between my transmission and transfer case thats about 1.5 feet long.

i wanna know how hard it would be to swap my transmission to a np540 5spd.

i know that the bigger trans isnt too much longer, and its pretty compact for a 5 speed, but i do not know much about this transmission.

where should i look to get one, how much would i expect to pay, and if i found a used one in some random dump truck, would it be bad if i swapped it in without rebuilding it first?

also, does it have a regular 23 spline input shaft that would fit into my stock 11inch clutch disk just like the np435 one does? and would it mate up to my bellhousing? i know this tranny came behind small blocks, i seen a w500 truck with a poly 318 and it had a np540.

i really like the ultra deep 1st gear on this trans, and the fact that many of them come with a 4.05:1 2nd gear and a 1:1 5th gear which would be perfect for me since i have 35's and a 4.10 rear end. and i like the idea of having a "short 4th" gear for highway passing.