Early Hemi swap into my 1973 scamp??
Yes, it has been done. And it looked awesome.
There was a site that a guy dedicated to dropping a 354 into his 67-69 (can't remember which year exactly) Barracuda. The fitment was fine and he felt the 354 was the motor to use.
Of course, a hemi into an A-Body is the ultimate of ultimate's but a 354 weighs 700+ pounds (someone correct me if I'm wrong here), and you could build a 360 that would make equal or more power and have 150+ pounds shaved off the front end (thats with Cast Iron heads too).
Depends upon what you want though; I would like to see you do it, it would be kick ***. I would be very tempted to do it myself if I had a 354 laying around :-D
Good luck,
Tyson