converting to standard

[pimperout]

i found a truck at a friends place its a 67-68 1 ton with a big block of some size and its 4 on the floor which is the exact thing i would love to put into my truck only problem is mine is an auto and its a 70 GM. do you guys know how hard it is to install a clutch pedal is it a direct bolt in or what? will a stock 4 speed fit into a truck with a low hump trans tunnel? what are the differences in length in drivshafts between a small block with a TH350 with a long tail and a big block with a stock 4 speed? feel free to throw in any more vital info thanks guys