what to look for in BB mopar motors?

I'm going to look at some mopar parts-- he has 2 BB core engines 1-383 & 1-440-- is there such a thing as a truck/ tall block-- ? Or are ll bb mopar engines the same?
also has a 727 tranny-- basically you have to take some junk for the decent stuff--- I'm not going to build any BB items any time soon--


Thanks Lawrence