Welcome to FABO leonard. Check your fender tag. Plate is located under your hood on drivers side inner fenderwell close to radiator support. Will have stamped alphabet (A thru Z ) on third line. If you have a 31 stamped under the AB it is commando engine. 30 under AB would be a 273 2bbl. engine. Also if car is a formula s it will have a tach on dash(left of steering wheel), formula s badges on front quarter panels, front sway bar and 14" wheels and front disk brakes.
Oldschoolcuda