Re: 2wd->4wd convert for heavy towing - SFA or IFS?
Let me start by saying I only know an inkling of what all of this swapping involves but heres some basic things I can tell you
IFS is pretty complicated, plus it's not to great off road, I THINK it would be hard to put 4wd IFS in, but what do I know, though, if you're going to bother swapping, go with a nice SA
I assume a T case from a pre 88 chevy TH400 4x4 truck will bolt to yours, and is so, you may just want to find a beat 4x4 truck with a TH400, then you can use the front axle, T case, drivelines (maybe), and springs, all you'd need was the braketry and some fabbing to hold the T case in, plus most likely some exhaust work
Lastly, any store bought kit is going to be rediculously expensive, I think I've heard of a few home fabbers making them, I'm sure Wills will eventually in his quest for fabbergoddom, try and find an alternative to the $1000+ kits, but now that I think of it, would the kits even fit a 2wd?
Anyway.... good luck