Engine Power

I am new to mopar and my pops and I just purchased a 73 Swinger to rebuild. It has a 318/904 combo in it. I think the heads are stock. I have not even taken delivery yet. We want 325 to 350 HP out of it. Is that reasonable out of a 318? And what would you recommend I do to it to get that out of it. Also, how strong is the 904 tranny, anything special I should do to it. I am new to the mopar scene, always been a chevy guy so I don't know much about em except I like em. Any help would be appreciated.

Thanks,

Rusty