Very Low Compression 8BA - No Fire

[Eagle43]

I'm still struggling with the 8BA flathead in my 1952 F1. When I worked on this motor originally I stitched 2 cracks between exhaust valve and cylinder wall on #2 and #3. I replaced the hardened valve seats. Last year I finished the restoration and it ran fine last fall. This spring it started to misfire on the first run to a club meeting. Eventually I discovered that the insert on #2 had popped out. I replaced the insert and valve. I shared this experience in https://www.fordbarn.com/forum/showt...hlight=Eagle43
It ran fine again on our last club fall tour but #2 wasn't doing much. I decided to try to fix this before putting the truck away for the winter. I took off the right head and the intake and found that the insert was loose again. This time I put in some shim stock and the glue and again ground and lapped the valve. Since the left head had a small crack next to the spark plug hole #6 and was weeping, I replace both heads with a good ones. I also replaced the head gaskets.

I have everything back together and the engine won't fire no matter what I do. It has good spark, the timing is on the mark, it has gas squirting in the carburetor. I checked compression and all of them are very low. Blowing compressed air into the spark plug holes shows air escaping out of the oil filler. For some reason the rings aren't sealing enough to fire. All of the cylinders except #2 had around 60 - 70 pounds before I took things apart and the truck had lots of zip and no blue smoke. I squirted oil in the cylinders and it makes no difference.

Anyone have any ideas as to what I can do to get this thing running? My frustration level is pretty high and I'm looking for a different engine.