'68 Pontiac Firebird Sprint 250 OHC 6 cyl. Currently @ 215, less 20% gets you to 172 hp.
Big camshaft, nice intake, good exhaust situation, belt driven camshaft, Quadrajet carb...lots to like.
Currently it's a 14 lbs car @ 3080 lbs. (incl. driver) so that's not going to work. But at 172 hp and 3080 (incl driver), it's a Q/S deal that could go R/S (stick and auto).
Would likely give those 318 2 bbl Darts and Barracudas fits.....