Pretty certain none of the modern American TTs will work on a 4-piston caliper (early Corvette and 67-68 Camaro/Chevelle/Impala).
I do know the 60s-70s TTDs, Appliance TTD copies, E/T I mags, and early Cragar G/Ts will work with the 4-piston calipers without a spacer.
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