just purchased a 68 gmc have a few questions

[68jimmy]

hello all. This past weekend I picked up a 68 gmc lwb 3/4 that is in great shape! It came equipped with the 351C V-6 with a three speed (was three on the tree but converted to a floor shift) and power assisted brakes (drums sadly). Now that you know what I have here is what I want to do:

1. convert the front-end to have power-assist disk brakes, power steering and five-lug bolt pattern. From what I've read so far a cross member from a 73-80 should do the trick?

2. replace the heavy rear leaf springs with some from a 1/2 ton. What year of chassis do I need to take care of this?

3. replace the rear differential (dana 60?) to what? and from where?

4. replace the original three speed with a four speed but not one with the granny gear. any ideas here?

5 and finally what do I do about that split drive shaft? do I wait until I get that four speed and differential swapped to get a better idea?

From all I have read so far there seems to be some very creative folks out there... Any help appreciated!

donovan