What is a good combo for turning high rpm?

You're getting away from my comfort level in terms of what I would normally build but I dont think I'd put a Scat peice into it. By the time it's trimmed and lightened it's still not as good as a purpose built billet. It's defintaely cheaper, but I don think I'd do it. The longer stroke does make for faster mean and peak piston speeds which means rods, pistons, and pins all need to be the best quality. It also means you need to have ports that will flow what it's going to need and a cam to work with the heads. I dont think the RHSs in any form could do it, even on a 318. I'm curious if you've tried a larger rated 4150 series carb on the 318? I'm not a fan of Demons in any form due mainly to manufacturing defects that are still overly abundant. But I'd be curious if something like the Street Avenger 770 might not work well on it and get it to make power higher.