i built a couple motors with king bearings and wasnt thrilled at the prep work i had to do to them including deburring to make them the same quality as a ACL bearing. If the customer is doing it themselves ive been suggesting Cosworth as they are pretty close to on the money. if im doing it i use ACL both h and hx. Bearings is not somewhere to cut corners... for the extra 40 bucks that the cosworth ones run they seem to check them twice before sending them out.
just my 2 cents.