Not sure what a conversion would cost, used to be approx. $1,800. If its and old 351 you will also need to change to stainless valves and hardened seats. An old motor switched to gas usually burns valves !
For $1,800 you can buy a lot of real fuel.
I had an Eb 6 cyl as a co car on gas. It was always underpowered on gas, particularly noticable in the Snowy Mountains and it used approx. 20% more litres. Cold mornings, ie 0 - 2 degrees, would be lucky to get 300km out of a 60l tank. Normally, doing 5,000 km a month it was cheaper to run on gas.
When I bought the car for myself, I took the gas kit out and sold itfor $500. At 200km a week as a private car it wasn't worth having.
Trust this helps
Last edited by xarpo83; 12-10-03 at 10:42 PM.
Reason: 5000 km per month, not per week