I have a Currie built 8" in my '66 and it's worked well for several years. My 306 developes 300@5100 and 350@3750. This with a C-4. Auto trannys are easier on rear ends than standard trannies usually, if the stall is reasonable and with sreet tires. If the 5.0 is stock or mildly modded, you've got no worries if the 8"is in good shape.
Rev
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'66 Coupe, 306, windage
tray, TRW flat tops, 351W
heads,pocket ported, 268
CC hydraulic cam, R tip
R's, Edelbrock Performer,
600 CFM Holley vac. secs.,
Mallory Unilite, coil, fuel
pump, Tri-Y headers, 2 1/2 "
custom pipes, 3 chamber
Flows, stock C-4, 3.25
Currie built 8" rear,
March under drive pulleys,
13.97 e.t., 100.1 mph
1/4 mi.
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