Flathead low intake vacuum

[oliverguy]

I’m working on a 46 ford flat bed truck. It has 78k miles on it and it has not been on the road since 1976. I have very low intake vacuum, only 6” at the wiper port. All cylinders have 50 psi of compression. I’ve found some leaks and also changed the intake manifold gasket because some bolts were loosened to replace the spark plug wires.

Cranking the engine over I watched the valve lifters
And all of them are Moving. I put some oil down each spark plug hole. What would be causing these low readings? I have nice hot spark and plenty of fuel. I can’t even get it to cough at all. I timed the
Distributor on the bench, could the timing be off enough to not have it
Even try to fire?