1966 valiant worth getting a 230 (or 240 can’t remember the numbers)

moparkrazed said
Do you think the a 903 will hold up behind the 225 with a slight bore and cam? Prob nothing too crazy.

Sounds like mine is a lot stouter than what you're planning and I have the original A903. I don't know how much driving "like this" it will take. So far it's held up good, but this is the first I've gotten in it this hard.