Need top end advice

I can't help you with this decision, at all. sand
I don't want to be a kill-joy .............................
but;
in a factory-tub 67Dart with 255s being as big as fits, even 350hp is a tire-fryer; even in a big-tub, heavy, FB Barracuda like mine, with 295s, 350 is lots.
I mean if you just want to spend money, I got nothing against that; but on the street, the stroker is way overkill......
I mean you could probably put small-port factory-type heads on it, and still smoke the tires to 80 mph....................................... or more, lol.
Fun? heck-yeah; but
dangerous as hunting bear, naked, with nothing but a pocket-knife.