Need Some Info: 6 Lug to 5 Lug Swap

[myoldchevytruck]

I have an opportunity to buy a neighbors truck for $250.00 to $300.00. I'm not sure what year it is but I do know it's a 73-87 Chevy Truck. My question. I have a 1969 GMC SWB with 6 lug drums all the way around and was wondering if I could use the 5 lug disk components for the front and swap the 6 lug rear end for the 5 lug that is on this 73-87 Truck. If so, is the front swap a bolt on conversion or is there alot of fabrication involved. As for the back, I'm currently converting leafs to trailing arms. Will the 73-87 rear end even work? If so, I'll wait to weld on the new axle saddle brackets I purchased from ECE.

If the 73-87 does not work, how about any of the later model full size Chevy's?

Thanks