75 valiant 225 to 440 swap help!!!

Im making the swap fro a 225 slant 6 to a 440>>> Right now im looking at a radiator and dont know what i should go with. I gave found a couple witht the same sizes as the 225 and the cooling specs for the 440( 66-69 plymouth belvedere)???? specs are same... NE ONE have input i am all ears..... Im also looking for any other this i need to convert.

MY LIST:
Rear Axle 8 3/4
Shorten drive shaft
new radiator
pan ( have)
moter mounts
headers(any input on other headers that would fit would be nice)


Anything im missing???

Thanks for your time POST UP!