I am about 99% sure the hydraulic valve lash and pivot arm are the same for all the OHC series 1966 through 1969. It wouldn’t matter if it was a base OHC or a Sprint model. I’m sure someone else will chime in as well. The differences between the 230 and 250 OHC and Sprints (on the top end) would be in the valve springs, valves and camshafts.

You stated that he replaced the pivot arm assemblies. Were they all replaced or only a few. Also did he replace any of the hydraulic valve lash assemblies? I can only come up with a few scenarios that might explain what happened. 1) You have an upper lubrication issue such as a blocked passage starving the top end. There is some history of issues with these motors, but generally it is after something else was done, like a partial or complete rebuild. Before this issue, how long have you owned the car and has there been any recent maintenance. 2) There was something wrong with some of the valve lash assemblies in the first place and he aggravated it by only replacing the pivot arms. Did he show you what the pivot arms looked like before they were replaced? The top part where the cam rides should resemble a semicircle. When excessively worn, they flatten out. When you put two of them side by side, it is pretty noticeable. 3) He didn’t use any prelube assembly and they got wiped because of lack of lubrication. Also encourage you to search for zinc in this website especially when it comes to the OHC.

I do know that Kanter sells overhaul kits for these engines, but I don’t know if you can just get only the top parts. I recently bought a timing belt from them and they are real good about getting the parts out quick. Also, I see these components on Ebay from time to time, so if quickness is not an issue, check there. Also I recommend you post this message on the OHC Six forum, as there is a lot of knowledge on that board.

It is hard to believe that you have a Sprint package if you only have a 1 bbl carb. Never heard of anyone going from 4 bbl to 1 bbl. Lots of folks go the other way. Best way you can be certain, is to look at the code on the engine. It is on the block near the oil fill tube. Compare this to engine codes from 69 and you will have your answer. Somewhere on this site in the FAQs are all the engine codes for 1969.