[RichardJ]

From OP's video on post #17.
Blue paint and dimpling on block indicates possibly mid 80's Mexican block. No big deal.
Plugs in head for A.I.R. smog tubes. No big deal other than '67 or newer 250 smog head. Again, no big deal.
I think they started with taper plugs in 1970, but that's not written in stone as far as I know.

Looks like two wires from coil to-distributor indicates some kind of non-points ignition module.

Start with checking for the correct plugs and replace with new. Start engine and check for vacuum leaks. Then check out ignition system.