Anyone put a Hemi in an early A ?

Yes, it fits...almost. Richard Petty did it in a 64/65 called "Outlawed" for his short drag race career and someone is doing a tribute car. He said it fit like they had it in mind. Headers would be easier as they start at a beneficial angle already, not a 90 out the head like a wedge. Looks like the only major mod is the shock tower (just the brace) being moved out 1.5 inches.

http://www.1962to1965mopar.ornocar.com/mmo12007.html