10 or the slightly heavier 12 bolt , Oh mid 70's chevy burbs, blazers and 4x4, all had 6 lug and parts are easy to obtain. they came in 3.08, 3.43 and 3.73:1.0 ratios. spring purches may need to be moved as well as shock attachments on the axle. It's funny now, the manufacturers are placing the shock mounts on the outside of the springs like our trucks AD's but for years they had them way inboard. GO FIGURE.
cheers

Jim & Caroline
The highway is for gamblers, better use your good sense."
Gooday-that's my 1¢ answer due to the lousy economy ~ cause I ain't got - no . mo . doe
Every Shaver | Now Can Snore | Six More Minutes | Than Before ... | Half A Pound for Half a Dollar | Spread On Thin | Above the Collar || BURMA-SHAVE