Before I make a mistake please help new mopar fan!!

I'm surprised at how difficult some people are having at finding 440s. I set out to find one starting a few years ago and now have three 440s and one 400. I'm not a Mopar expert, but if it were me, I'd hold out for a 440. I pulled one of mine out of a 1977 motor home with 69 thousand miles on it. I was able to hear it run and assess the condition. It ran excellent and I got it with a 727 for $200. The trans is not usable in a car because it lacks a slip yolk so I'm keeping the trans for the internal parts if I ever need them and stored the engine and keeping it stock in case I need something to use if my built motor fails. I think that for a low cost build the 440 is the best choice.