73 and up only needs a compression boost and tuning to get some go power.
There were some good changes in 73 for SB V8 A bodies also:
26" radiator
spool motor and tranny mounts.
low gear set 904s
part throttle kickdown
OD 833
Dual snorkel hood scoop I think was 73?
Better designed air box for AC
Heavier front end parts from B bodies were used.
Better front and rear brakes.
Side impact bars in the doors.
I'm sure there is more to list.
