Crossmember swap

[steppside69]

I have a few questions on a front crossmember swap,

#1- I have a 69 short step with drums (no power) all the way around, Now I can potentially buy a front crossmember disk-disk with sway bar 5 lug, If I understand the swap right I just unbolt my complete crossmember and bolt the new in?

#2- I also can get the rear end (to complete the 5 lug swap) I dont know if the rearend is a posi but the question is could I swap the axles from the 5 lug axle to 6 lug rear end housing? My truck originally has a 12 bolt posi

almost forgot the donor truck is a 78 chevy 1/2 ton scottsdale

Thanks for the info, Eric