Help on 408 build

PRH said

The verification that the cranking compression is too high is the fact(from what’s being described) that it won’t even come close to running on pump gas, even with octane boost added.

Sure, double checking with another gage is fine....... but whatever the CR is...... it seems to be too high.

I’d plan on at least pulling one head for some measurements.

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Agreed.. but it could be something simple/silly like the cam advanced a tooth. Getting the numbers to hang together is worthwhile IMHO. Example: 240-260 psi is just not sensible at all for this setup; that should have been questioned earlier IMHO. So if we get some other odd numbers, then it is worth questioning. Working 'long distance', you need all the clues you can get.....