How easy to get 500 horsepower w/ stock stroke 440?

Depending on Year of Motor your starting with, Really easy to get that power, 1 of the most underated motors out there in my opinion, they rated that motor from Years 66 to 70-71 at 375 HP for Insurance Purposes, I have an true first gen 440, it was actually built in 1965, didn't even have 440 heads on it, infact it had 383 heads on it according to the books, this was real common when they first was introducing it to dealers as an engine option, my 440 was built for these same target numbers, 500 HP 500 TQ, my machine shops is pretty confident it will dyno in on those numbers just haven't had time to do that, I'm really sure you can hit your target really easy!!!!!!!