I have done some reading on cams lately since I found my timing chain has slack. Comp Cams has a performance solid lifter cam they say works on slants from 1960-1987. You can find on ebay or Summit for ~$130. What they don't tell you is that for your hydraulic engine, you would need to get adjustable rocker arms and pushrods from an earlier (solid) slant. I haven't heard of any performance hydraulic cams for a slant. Check with Oregon Cam since they could grind one if anyone could, though switching to solid lifters might be better, if you don't mind adjusting valves every few years.