Re: does anyone run an old ford that can help me?
Unleaded has no lead, and lead is like an octane booster and helps to stop ping, also lubricates valve stems etc too.
Unless you've replaced the valve stem guides and gotten hardened valves, it will most likely be damaging them.
You also should replace the plugs, as they'll most likely be burning away after that much time. Take em out and check em.
As Cobra says.. put the supliment in.. but check the plugs are fine.
88 EA Falcon S
RIP my ol' esky.. many years of good service