Check to see if you have a switch on the inside firewall where the clutch petal goes though the floor. I can’t recall offhand what it is called but the clutch has to be depressed to start.
My first car 70 swinger 340, 4 speed originally plum crazy. When I bought it in 1980 for $300 it was already repainted in red I sold it 4 years later bought the hemi orange one I now in 2016.