More cubes for sure. The 393 stroker will suck up your 5 big ones and leave you with a half finshed project
albeit a good one!! More horsepower means an exponential amout of $$$ so its doesn't explode!
351 crank with your 302 rods is a cheap option - drops straight in. Good exhaust, carb & manifold. Then the heart of it all, heads/cam.
CHI heads fully setup with valves are real cheap these days.