Rear Axle Help????

[troy54gmc]

Ok guys i need some advise from someone who has been thru this. Im almost done building the rear frame on my 54 and i had originally planned on putting a ford 9" rearend in it. I put a 75 nova subframe on the front and its got disc setup with 5 on 4-3/4 bolt pattern. The ford 9" has nothing but the axles and they are not the same bolt pattern, much larger. So my question is should i stick with the 9" and if i do what is the easiest way to get the bolt pattern to match the front? if not what is a better choice axle to go with??? I was at the junk yard today and can pick one up with everything on it including brakes for under $100. depending on which one i go with.
Ive read the s-10 4x4 rearend is popular??? Im gonna put a 383 stroker motor with a 700r4 tranny hopefully around 400hp. Any insight would be greatly appreciated......Thanks.