cracked 273 heads

I got the bad news today, one of the heads on my 65 273 comando is cracked and not fixable.
So Im looking for ideas on what way to go.
should I look for another 65 273 head,knowing that a wrong size head gasket is all that is available, And that is what caused the problem in the first place. or go with the 304 heads if thay work on a 65?? 273 or put a 318 in it and call it good. or is that a can of worms too. like engine & trans mounts, trans out put shaft ect.. any help THANKS in Advance!!
it is in a 1965 Barracuda Auto trans