Just taking a stock Vortech 350, and putting a carburetor manifold bring some to almost 300 hp, and I’ve seen some well tune stock Motors make 350 with airgap intake and headers! The GM hot cam, it’s just the LT4 cam out of the performance package for the Corvette, I have a local cam grinder that grounds me roller cams in those specs for about 125 bucks, the only kicker is is his cores don’t have a fuel pump lob. LS3 springs and comp retainers cost around 100 125 bucks, Got a set of Malhe hypertechnic flat tops for 150 bucks on eBay, Finding a good core is pretty easy as well, as you know a bazillion suburbans had them