Stock main bolts?

Studs provide the ability to obtain much more accurate torque values because they don’t twist during tightening as bolts do. Because studs remain stationary during nut tightening, they stretch in one axis alone, providing much more even and accurate clamping forces. You do not need to align bore when going from main bolts to studs, but I would say you definitely need an align hone.
Swapping in some ARP main studs without getting an align hone can give you problems. Torque the main cap bolts to spec and check the main bearing bore with a bore gauge. Then replace the bolts with mains studs and repeat ... The main bearing bore will probably be out of round with the studs and no align hone. Spun bearings are nobodies friend.