68 GMC 3/4T D60 rear to 72 K10 swap?

[franken]

Hey,
I've done some reading and wonder if a 68 3/4 ton 2 wheel drive Dana 60 rearend will bolt in in place of my current 72 K10 rear.

What I read was the 68 rear had a spring perch center width of 42.5" while mine should be 40.5. I only found one post saying the spring pad width was different.

My truck is a mongrel made up of parts from 72, ??, and it seems and 85, but the spring hangars look original.

The 68 is in the scrapyard and I'm looking at $150 to get it. Its missing drums, axles, and hubs. But, since the D60 is common, I may be able to troll the yard and scavenge the axles and hubs. Maybe even a later disk setup.

The gear was 41 9 which divides to 4.56. I was thinking more about a 4:10 rear with my planned 5.6 1st (~4.5:1 max low range).

I'll need to locate a front diff to go with it, or rework my D44 6 lug.

So, are the spring centers off, making this a no go, or is the price bad? Good?
Wait for a decent deal on a front/rear combo? I'm in no real hurry. Still working on the NV4500/doubler/NP205 combo.
Any opinions on 4.11 vs 4.56 combo? I'm looking at a 2-4" list and no huge tires. Probably 33s.

Any comments or advice welcome