Is an AAM 10.5" rear end from a 2002 Chevy too wide for my fleetside '66 C20?

[Rust-O-Matic]

I'm looking to replace the Eaton HO52 in my '66 C20 with a newer axle with better gearing and parts availability. I found a 2002 "14 bolt", though I don't think that's the correct terminology for '01 and up, with disc brakes from a 2002 Chevy 2500, but I'm afraid it will be too wide to fit my stock type steel wheels inside the wheelwells. The seller measured "around 67-68 inches" from outside or rotor to outside of rotor, and I have read that my HO52 should only be about 65.5" the tires are currently about 1.5" from the wheel well lip, so I'm concerned they would rub.

Has anyone done this swap before? Any idea if it will work?

PS, I'm aware the perches, etc. will need to be modified. I'm just concerned with the width.