That's exactly what's on the Chrysler. Donovan cover, candlestick, Hilborn fuel pump. Missing in the picture was the blower and bird catcher. Or maybe it was a smooth bug. I think Donovan made the cover big enough so that you could degree the cam in the car. Either way, on the 302, it's just a cap. I was measuring for making a bracket.

I pulled the cover and the cam is set straight up. Ordered some valve test springs and will get some numbers when they arrive.

While poking around the internet, found these little gizmos. https://www.lindytools.com/ihpc Might just be what the doctor ordered.

The gizmo in operation on an LS motor. Youtube Video Piston Valve Clearance Cutter