Ummm, pix??
It is possible to mount the suspension, there's several here that have done it. Noce thing about the '70s Chevy trucks suspension is that the entire crossmember can be removed from the frame intact, without cutting the frame itself. As far as getting the ride hight up, if the current suspension is working alright, you could go with a set of stock spindles and possibley a set of stock replacement springs to get the ride back up. Going Mustang 2 will most likly make it even lower, rather than raise it. Same goes for the S-10 swap.
On the rearend, it probably wasn't centered correctly on the spring perches, especially if it was converted from spring under to spring over. It should be noted, the factory rearend was not centered in the opening on the AD trucks originally. They were roughly 2 1/2" forward of center.
