Has anyone every owned on of these engines, the one with the red crankcase? Are they any good and what manifold fits this engine?

I think the Picco headers fit good.

It has the same crankcase as the black magic off road .21.
It takes a special manifold as the exhaust port is at a slight angle downwards.
Axe Magic pipes are good so you shouldnt have hassle.
These motors were/are extremely popular with the drag racing guys.Apparently they can make big power.