Slant six 1920 stall

I also found my paperwork for the cam I got from Oregon Cam #819, intake and exhaust clearance is listed at .012.
Found that I do have a fuel pressure gauge on my OTC along with vacuum gauge. Ill check timing and fuel pressure tomorrow. Been crappy rainy here.

For testing purposes,
So the first thing I would do is; warm it up, then reset the valve lash to minimum .013 on the intakes, maximum .023 on the exhausts. But make sure you use narrow feeler gauges no wider than the valve stems. While the covers are off look for bad valve springs and bent pushrods.
until you do this I ain't saying nuttin' more.