No such thing as a bolt in... unless you get a 55-59 chevy or gmc rear. Interesting side note... gmc rears had a 3.08 ratio available.

The closest to a bolt in would probably be a 10 or 12 bolt truck rearend. If using a 1960s vintage 12 bolt, even your parking brake cables will work. The perches do have to be cut off and new axle perches welded in.