dual fuel (propane and gas)

[gingerbreadmaniac]

I currently have a 85 f150 300i6 4x4 on propane, up here in iglooville gas has topped $0.99 a liter and propane is around $0.60 a liter, i figure i loose a bit of gas mileage with the allready low powered 300i6 and thats why i get 10mpg but its still worth being on propane.. anyways. Iv looked at a few 77.5-79 f250 4x4's, I know thats what my next truck will be. but Im contemplating a duel fuel setup. propane and gas. I think id like to remove one of the tanks under the bed and put the propane cylanders down there. i will then get a old school tank to mount behind the seat. (this is also handy for running purple boat gas ) since ill have the fill spout inside. I have a propane setup on my truck, it is a 225 cfm. I reckon for a 351m/400 soon to be a 429/460 that wont cut it, but my questions are. How does a dual fuel setup work? what size cfm propane setup would i need? what would my current truck need to be converted to duel fuel? just so i can picture it in my mind. -gbm-

[Torque1st]

Moved to proper forum.