you best bet will be a 5.0L v8. They are generally cheaper than the V6, give roughly the same hp as the 4bbl v6 with a lot more torque. They've been building them forever(it seems that way) so there are a lot of used ones and plenny of parts and suppliers. They are easier to work on than teh Most of the ones I've seen actually give better cruise fuel consuption than the v6. the 5.7 is thT same weight and size, but they usually carry a premium price tag. The 3.7 was a good motor in its better days(87 and later). But they are getting scarce and expensive. The 3.0 will work, buts its going to be working hard(and burning lots of fuel for the speed)
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