MBL,
You're making progress, that's cool. I'm happy to read that.
I'm all for checking the easy stuff first. A squirt of starter fluid in the motor should be enough to get the motor to at least fire momentarily. If so, then pursue the fuel idea. I wouldn't think a can of octane booster would snuff a motor, a tank of fuel filled from a gas station that cuts its fuel with water most certainly would however.
Remember, just because you have spark you have not ruled out the ignition as a source of your trouble until you verify the timing of the distributor, as I described previously. The timing chain may have slipped, especially if your motor still has the oem, "silent chain" installed, the one with nylon teeth on the cam gear. To check this, you'll need to pull the bulkhead cover.
Your friend on the DTBB, George
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