When I built my 383 I used Withers Automotive in Collingswood. They are not the cheapest around but you would have a a hard time finding someone with the amount of knowledge and experience. Their shop is down a driveway behind a house, almost looks like your pulling into someone's driveway.
For regular stuff I've been using Chris at Burington County Auto Parts (in Burlington city), I know he does head work but I'm not sure if he does block machining. He's done a good amount of work for me and I've never had an issue.
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