[diesel_john]

a decent price on propane is $2.25/ gallon right now, but you will need to have your own 1000 gal. bulk tank and transfer pump.
they have electronic controlled propane injection in europe.
you can put any engine in any car, it is only a matter of time and money.
if you have a limited amount of either, then get a mustang put a 2.5 differential in it out of crowny vicy or whatever at $200/ton (ford made a ton of them) and drive it.

oh by the way it has been illegal to put any non compliant engine in an emissions regulated highway vehicle since like 1975 or maybe even 1970, not that there is any thing wrong with that. But federal does include most states. not that there aren't loop holes.