Would the 4.7 liter from my 1999 Jeep Grand Cherokee fit in an A body?

Okay - thanks all. It was a momentary whim resulting from trying to make lemonade from an old friend - that Jeep was really good to us in Buffalo and Chicago winters. I'll look into selling the engine to someone who needs it.

For the record, the 4.7 in the Jeep was in no way gutless - that thing had all the power we needed from it.