Problem is fixed.i believe the caps and connecting rods are missmatched , i did it before on a buick when we cleaned up the piston and connecting rods it was very hard to turn. we went ahead and finished and the engine did start and run for about ten seconds and seized.the plasiguage does work, but if one connecting rod is mismatched with the cap there is going to be a problem, and what you are describing is exactly what we experienced.
Shane