Here a few pics for info.. Cylinder head and intake valve area. 1.75 valve seems generous given the size of the engine.
The block, 3.125 bore, stroke 3.5, exhaust valves are 1.25
It has an integral head/intake with a Carter yf. I have another head that I have been working on. I milled the side off the intake area and am fabricating a manifold for two Carter yh side draft carbs. These engines were made in Brazil with two Carter yf down draft carbs so I don't think I'm going overboard.
I've already fabricated headers and have been running them while I was debugging the first runs of the truck.
Why do this on such a small engine?...Gotta try something different now and then, right?