Engine and tranny swapping questions...

[Matt_305]

My truck (81 gmc lwb 1500) currently has the 250ci straight six mated to a 3 speed auto tranny, my other truck (85 gmc lwb 1500) has a 305V8 mated to an SM465.
1)Are the drive shafts the same length or compatible? (305 has 2 piece 250 1 piece)
2)Is the clutch pedal mechanism and clutch fluid resevoir etc hard to hook up?
3)Is the shifter hard to line up through the floor?
4)Any other difficulties I should know about?
5) Are hoses and wiring etc. hard to figure out and make compatible?
The front ends of both trucks are already torn down except the front bulkhead I guess you'd call it (what supports the rad). Thank you for your help sorry to ask so many questions but I'm a bit of a newbie at the whole thing but have come this far and feel hey why not go all the way. Thanks again.
Matt