I wouldn't worry about the ARP case bolts personally. The higher strength case bolts which require higher preload can distort the main bearing bores and their alignment, neither of which is a good thing for engine longevity. On the flip side of that, anything you can do to stabilize the engine case will help with longevity and help the engine withstand higher power output. If you install the high strength case bolts, and the main bearing bore distort, then you need to have the main bearing bores line bored which is a pretty risky operation unless the machinst is very competent in the operation on these engines.
Just my $0.02, and others with more direct experience with these engines may chime in and disagree.