[blykins]

A hydraulic roller would work fine for this engine. With the right springs, you could make peak at around 6000-6200. I agree, a dual plane wouldn't give you what you want. I'd go with a Victor Jr.

BTW, I sell Probe rotating assemblies, pistons, cranks, rods, rings, etc. I also sell Jones custom cams. Shoot me an email if you'd like to talk about products. I can guide you in the right direction.