anytime you use ARP/Raceware main cap studs, or case bolts on an engine like a porsche, they apply more clamp load and distort the main bearing bores. In your case the block and caps or girdle must be assembled and torqued to specs, then the main bearing bore must be align honed to bring the bores back to a concentric spec.
If you use them and don’t do it your motor will not live long, that’s if the crank even turns upon assembly.