Realistic valvetrain expectations.

Aside from having three rings per piston, and four strokes, there's not much of the same. If you're thinking it's that simple, ask yourself why at best the engines of the day, supertuned but using stock parts aside from maybe a cam, could barely muster 1hp/inch. Or why every oldschool V8 isn't reaching that potential even using modern parts.
As yourself what difference thing rings, short, lightweight pistons, much more solid foundation (block), a crank driven oiling system, valvetrain parts based on spintron development over years...
Seriously - not everyone can do it. I'll bet the vast majority can't, and that includes many professional builders. Toss yours together, get it down the strip, and tell us what it makes (dynos don't count).

Andy - what is the displacement of that low deck you pictured?