LS powered Duster, Abomination or Go For it!

A legitimate Mopar show won't allow you through the gate. Sell the LS and buy a 5.2 or 5.9 from a junkyard RAM if you "need" a V8.
If you go GM, don't forget to paint the engine compartment black, the trunk blue-gray splatter paint, slapper bars of course, 3" chrome exhaust tip and every plastic chrome doodad from the glitter aisle at Autozone. Gotta go all the way or stay home.