"""""""66geeto, you say the engine builder is much more familiar with Chevies than Pontiacs.... One VERY common mistake that chevy builders make is to install the rods backwards. On a Chevy engine the bearing tangs go on the outside, or oil pan rail side of the rod. On a Pontiac they should be installed to the inside of the engine. The rods have chamfers on one side of them and the bearing is slightly offset to one side to clear the radius at the edge of the crank journal. If he put the rods in like on a Chevy it's very likely the rod or a bearing seized on the crank.""""""
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Add the effect of the Pontiac-specific Piston Pin Offset, and you know where my head is at on this diagnosis.
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Be sure to verify free movement of the slug pin on each remaining rod/slug assy.
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