Thanks for that- I want it to be a hydraulic camshaft and not a solid camshaft like I have in the 170. I have the motor in the garage and have not even looked as to what year it is yet, though I know it's pre-1970.
How do You know it's a pre-'70 if You don't know the year? You need to clean the pad off at the pass.frt.deck surface adjacent to the alt bracket, & get the stampings written down.
If indeed that is an earlier than '70, the factory cam is tiny! I have Dynosim modeled the OCG 2106R against the OE cams. & the "penalty" of the 2106R is really only below 1500rpm, from there it is all the OCG unit, peak hp at 3500-4K & a ton more in the 4-5K range. Hardly "hot street" territory, & really should idle fine.
