Finding a good 360 candidate

Hello ladies and gentlemen!

I am starting a search for a good candidate for a 360 swap for my 72 Plymouth Valiant more door. I am preemptively starting my search so I can find a good deal and/or a diamond in the rough. So what exactly would the perfect candidate look like, and what exceptions can be made?

If you feel like throwing this topic into another direction, I wouldn't mind talking about the overall build costs to hit upwards of 400HP..

Discuss away!
All input is appreciated!
:happy1: