Mustang boss 302 vs mopar!

the AAR cuda and the T/A challengers were brand new for 1970 and truly purpose built. the 70 mustang FB was nothing more than a carry over from previous years with the boss 302 , graphics and with new grill and taillight treatments. although the mustangs had been competing in trans am long before the E bodies, the mustangs were a style concept and not designed around the TA series

You need to read up on Trans Am and the HOMOLOGATION RULES.

The Boss 302, like the Z/28 (also equipped with a 302) were both purpose built cars for racing.

By 1970 de-stroking was allowed to meet the 5 litre engine size limit.. The Boss 302 was still competitive and carried over.

The Z/28 got a 350, but was de-stroked for Trans AM racing.

The T/A and AAR got a 340, but was de-stroked for Trans AM racing.