Fred, I think your first impression that the exhaust valves are stuck open looks more and more probable.
One item that may have caused this is the over heated engine prior to shut down.
My guys are going to remove the side panels to check it out.
the compression is as follows: all cyl 3-8; 0PSI, #1 5PSI, #2 25PSI.
I blew air into #1 and fuel spewed out #4 and #5 plug hole, confirming that fuel is not a problem.
It's looking better.

Bob

After reviewing the comments it would appear that the valves are opening at the wrong time. There is rotation at the distributor, therefore the timing chain is rotating.
How do I correct that problem?

Bob

some cyl had low 25 - 30 psi or none.

how do I tell my guys what to take apart in the least expensive manner to replace the timing chain.

My initial thoughts are to remove the hood, radiator, water pump, and front piece.

Too bad I don't have Packard dealer.

I'm sure any of my mechanics can replace the chain once we get to it.

Bob

I think the backfire broke the timing chain. What else is there. Looks like $$$$.
Bob

2014/02/07 51276 miles rebuild engine
new plugs, wires, ignition, rotor, carburetor
2015/12/22 new solenoid check carb float. miles 55642

I drive all my cars no trailer queens.

The reason for repairs is that the solenoid was dropping the voltage so low it was hard to start. However; it did start.

That is what's so confusing. As you can imagine, all of my work and money may be for naught.

I don't think a car that I routinely drive at 65 MPH would be sludged up. The oil is clean and fresh.

Thanks for your input but it looks like a tear down may be needed.

Bob

We just completed voltage, fuel and spark checks: all good.
we completed a compression check and found very low numbers 0 to 25 psi. This difficult to understand as car was driven into the garage for a new starter solenoid and a carb float check.
Prior to this time the car ran very strong and there were no indications of a compression problem.
When attempting to start I used starter fluid and had a backfire. Any connection I don't see it.

Could the timing have changed?

Help

Bob Hattler

I'll try the cotton swab on the vent opening. You are correct there isn't much gas, but I can smell it when driving on the interstate at speed, and of course when stopped.
The car is down for awhile awaiting a new solenoid for the starter. As soon as it's running again I'll post the results.
Bob

I'm not sure what to do now. Put back the same way I found it, and look for a different solution, like what?
Any clue would be appreciated.
It's a rebuilt fuel pump.
Doesn't the pump run at the same speed as the engine pumping more at high speed than at idle?
Bob

Pushing fuel out the vent makes complete sense now. It only occurs during high speed when the fuel pump is pumping at a maximum. I'll try lowering the float a bit and see what happens.

Wish me luck,
Bob

I checked the vent and it is open and clean. The carb seems to be perfect in every respect. But obviously I've missed that something which makes it spew gas at high speed.
Thanks for your help,
I've learned a bit.
Bob