When in doubt, check it out as far as needed to make you comfortable
Is Rettig Bros. machine shop in Fresno or further south ?
If they are close they would be the ones I would and do recommend, if not close or to busy to help you there are several others outstanding Mopar drag race engine builders near you also besides Rettig Bros.
I think Don Little is still taking in work, he is in Patterson
If he isn't he might be able to refer you to some else that is real good also