I'm sure your playing around but I use to be 100% against swapping from different brands especially for muscle type cars, but I do get why people do the LS swap, it's hard to say no to a cheap 500 hp engine, with a ton of aftermarket support, as long people don't butcher the car to get it in can always be swapped back out. Not a fan but understand the swap, LS I give a slight pass to but now you car is a Chev not a mopar anymore :)
But I'd go with the cheap magnum idea.