Wow! That's interesting to hear.
Honestly I couldn't say because I had someone build the motor . I do know for sure the I have stock 225 rods with the weisco pistons which are shorter. Meaning it would be .3" or so cylinder length to the combustion volume.

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( Slant Six 73' Duster TBI )

I would look at the easy things first. Are your valves seating all the way?

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If it was easy, everybody would be doing it.

I put every cylinder at TDC and verified by making sure there was no pressure on the springs, then I applied pressure to the cylinder. I couldn't hear any air coming through the intake or exhaust and didn't see bubbles in the coolant.

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( Slant Six 73' Duster TBI )

If there's no air escaping from the dipstick tube either, then maybe it's time to see just how far down the hole the piston sits at TDC.

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If it was easy, everybody would be doing it.