np203 to np205 help

[DESTRO]

Hello all,
I just got a 205 for the truck and was wondering what all would transfer over.
The truck is a 77 with a th350/203 combo. I just got a 205 with the adapter and shifter.
My questions are:
1. Will the driveshafts in the truck be the right length??

2. Will the front driveshaft flange on the 203 swap over to the 205?
[the 205 has a yoke on it,need the flange,if not wheres a good place to find one on the net??]

3. Can I get a gasket set for the 205 locally,like napa or advance[part #]

4. any general tips or tricks to help me out for the 203 to 205 swap??

Thanks