hello everyone . ive recently purchased a 78 305 2 bolt to replace the 305 in my 84 monte . it was already tore down with the crankshaft out and the main bearings and caps back on the block and tightened down .pistons as well has bearings in them and bolted and off to the side .my plans are an overhaul with all new bearings so i measured the cranks journals . after doing research the mains are to be around 2.45" and the rods are suppose to be 2.10". Mine are like 2.44 on #1 and #5 but #s 2,3,and 4 are like 2.43ish .all piston journals are 2.07 . i pulled the main bearings and they are stamped .010 undersized on the backs and the pistons are stamped .020 undersized on the back .my main question is , is it normal when a crank gets machined to have the mains and rods different undersized like this ? can i get my bearings in different sizes like this from one source or do i need to get the mains to match the rods .020 under size ?