The cars the 8.5 was offered in are wider then your 66. The f-body ones have leaf springs while your 66 has coils and a 4 link type setup. The only way to make one work would be to find one that is as close to the width of the stock 66 width as possible and relocate the mounting points.
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Eric
1969 GTO - 461, turbo 400, Continental 13", 3.08 gears. - 12.59 e.t. @ 108.43 mph, 1.898 60'
1978 Oldsmobile Cutlass Supreme- 461, turbo 350, PTC 3500 converter, 9" 3:50 gears. = 11.39 e.t. @ 117.55 mph, 1.599 60' on E85
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