365 or 408?

IMO there's more to it than the crank and pistons. I tell people add 25% to a budget for a non-factory displacement. A ver ymild stroker will work with stock heads. It will make torque like a Caddy 500 and rev just as well. So you don;t need gearing or anything. But you do need a cam, you do need the lower end work (I don't build any 4" engine without main studs which adds to block machining), you should address oil either with block mods or bigger pan and windage tray or scraper,and the carb needs to be bigger than most usually think. So there's money there. If it was me I'd just do the 360 unless the money tree fruits up.