Nick's Garage dyno's a 318 Stroker.
what's most impressive to me is the power with the combination of parts. there's nothing wild, nothing exotic and nothing super high dollar.
if you have a clapped 'teen in your ride this could be easily replicated on the minimal cash outlay side of things when you're talking building a 400hp motor.
if you already have a 318, likelihood is you already have a 4bbl and an aftermarket intake, maybe even headers. scoring a nice set of pre-owned 360 heads, or even used eddies wouldn't break the bank and those are things that come up fairly frequently.
that cam isn't wild by any stretch of the imagination, and could probably benefit from a custom grind with some tweaked numbers. with the RPM cap they ran it at, i wouldn't doubt that pretty much any 4bbl dual plane would make the same, or very, very similar numbers. add headers and a little more tuning and i'd bet this set up sees an easy 425