Later model 3.8 swap in an "A" body

b5demon said
If i was going to do it i would go with the 3.5L they are used in the chargers and 300 in a rear wheel drive configuration so you may be able to find a wrecked one and get the engine and trans assembly as a good starting point. Secondly the 3.5L run very well with a few cheap mods and some open exhaust.
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What about doing it with the 5.7 L Hemi that has cylinder reduction? Maybe a little less mileage, but alot more fun. If you compare the mileage ratings on the new Challenger with the 3.5 L vs the 5.7 L, there is not that much difference. Go look at them at the dealer.