Need to know the engine size.
350,400 or 455
what motor is in it?
The 1972 Chevy 350 has about 270 horsepower stock. This engine can be modified to put out up to about 800 horsepower.
266 is the Net Horsepower Rating of the 'M' or 'Q' code 1972 351 Cleveland engine. The 'R' code engine was rated at 275 net HP in 1972.
18436572 clock wise
5 X 120.7 (4.75) Bolt Pattern & with a 7/16-RH Stud.....
1-8-4-3-6-5-7-2 clockwise on the distributor cap.
7 horsepower @ 9,000 rpm.
Most likely other GM cars with a similar body style, like a Chevy Impala or an Oldsmobile Cutlass.