The 460 will have more power, perhaps 25 hp (because of the additional displacement). The 460 will also have more torque, not the 429. FYI you don't need aluminum heads for 500 hp (exception: D2VE heads) but the factory iron heads will need some modification.I have a 429 block (D1VE 6015 A)/flat top pistons..(going to bore it .030 over) and was going to build the bottom end pretty much stock and put on aluminum heads. Plan on using DJHOAGIN'S recommendations for the 500hp 460 pretty much as a guide.
Strickly a street vehicle..putting it in a 71 Ranchero. If a 429 & 460 were built identical using his recommendations.....how much horse power difference would their be using a 460? Since the 429 has a shorter stroke...my thought is it would have a little better low end torque and that is where it will be most of the time. If using a 460 crank is the better option I don't have a problem doing that...it's just that the one I have (429) is in good shape, not damaged at all. If you've already discussed this if you could direct me to the thread I'd appreciate it. Thanks George