budget street motor 360 or 383 for 71 duster

to make 450 hp with a 360, you will need aftermarket aluminum head or a ported iron. making a true 400-450 hp with a 360 for street use is not as easy as the dyno guys and internet bench racers would like you to believe. it's hard enough to build a 383 or 400 to make a good street driver at 450 hp.