I would do a little more research.... as for the A-body Chevelles (68-72) the common upgrade is the Jeep Cherokee box which is a faster ratio. That is what I put into my car.
'93 FD LS7/T56 Magnum/McLeod RXT/Cobra 8.8" IRS, Holley EFI, Ohlins coilovers streetable road race car 10.30@137mph
'93 FD LS9/88mm/T56 Magnum/McLeod RXT/solid 8.8"/ Holley EFI
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Project: 1969 Chevelle, alum 5.3, GTS76 turbo, Holley HP EFI, T56 Magnum, McLeod twin disc, Ford 9" 3.25 gears
I sell:NEW Magnum T56/TKO600's/McLeod/Holley/BTR/Wilwood/MS3Pro/anything LSx related!