Have a few questions - 83 CC 1 ton

[Mattman2010]

I have a few questions about a 83 Crew Cab 1 ton dually. The truck currently has a flat bed on it, I was wondering if a standard bed would fit on it, and could I put the dually fenders on that bed? Or would I have to find a dually bed?

I have also thought about converting it to single wheel, are the spring perches on the front and rear axles wider than say 1/2 ton or 3/4 tons? I have heard to convert the rear to single using 3/4 ton axles that you would have to move the spring perches out wider. is this true, and what about the front?

It has a 6.2 Diesel, While I will not be towing a lot with it (Vehicles, horse trailer), I hear that these engines really don't have much power, but get good gas mileage. I like that the engine parts for a 350 are cheap, but I also want some gas mileage and I hear that the 6.2 is really good for that. Would I be better off putting a 350 in it, or just keeping the 6.2 Diesel in it?

Thanks, Matt