Looking at the rules (pg. 3 here), it looks like the cut-off for Category I is 1970, however the original rules accepted the '68 cars & there's more than enough proof of them running in P/S, so like the 71-72 Valiants I'm sure they'll be accepted. Btw I was just looking at an old book on P/S & it mentions the first Mopar Missile ran a clutchflite which should stir up more debate as to what trans are legal for the class.