Number one main cap is in the front of the motor by the oil pump, the rod journals should be 2.375 stock, Mopar allows +.0005 or - .0005 for the factory tolerances, 2.3745 to 2.3755, .020 under should be 2.7555 tp 2.37545 Get the new main bearings and fix the crankshaft and then install the upper main bearings(the ones with the oil holes) in the block and then lay the crankshaft in them,use oil on the main bearings and crankshaft and then spin it, install the main caps so that two bearing retaining tangs are facing each other and then tighten the mains down to 85 Ft lbs, I use three increments, 30 lbs, 60 lbs and then 80 lbs. ,except number three,leave it loose until your ready to set the end play, and spin the crank. No main seal or timing cover seal yet. It should spin very easily by grabbing the crank snout with one hand and spin it If it doesn't spin easily find out why. You can also try spinning the crank on each main bearing as you tighten them down, just in case Let us know what you find, BTW, the main caps should not fall into the main saddles, they should have to be tapped in or push in very hard by hand I use a soft faced mallet to tap them into place