Need slant heads for OHC project

Adding to the existing head isn't going to make a speck of difference though. You're still going to have an awful flowing head. OHC isn't some magic that will turn the slant into some high-revving fire breathing monster, unless you take the time to properly redesign the entire head. In which case, it is debatable that it will make enough, if any, difference over a pushrod motor to be worth the effort (am I making sense still?). More opinion, rotating assembly/oiling is where I'd look if i were wanting to spin something to the moon.

For example, the Ford OHC V8 was mentioned. It just so happens that I went with a buddy of mine to get his '96(?) 4.6 SOHC Stang dyno-tuned. Highly ported and polished Police interceptor heads (because apparently the stock SOHC heads are corks), Ford racing intake and longtubes, .500 lift with 114* lobe sep, and I believe 300ish* cam. I'm sure I'm forgetting other stuff. Anyways, he made 303hp at the rear wheels on JusTune's dyno. Around 350@ the crank. Oh, and this motor spins to 6300, same as a pushrod motor.

Like Pishta said, care to show us drawings?

If you're serious and want to do this personally, have at it. Oddball projects are neat, even if they are pointless. But please don't get peoples hopes way up only to drop 'em off a cliff lol.