It isn't mandatory, but it is a safe-guard to prevent firing up a motor that has been poorly machined or cast. I would say do anything you can to make sure it is perfect. An engine builder that I know doesn't use it, but he blueprints every engine.
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88GT stock shortblock, ported GT-40 iron heads, ported Edlebrock Performer intake, 24# inj, Pro-M 75mm Bullet MAM, 3.73, hurst short throw, F-303, electric fan, alum rad, FMS HD clutch, R134a ac conversion, 70mm TB , and some other stuff I probably forgot, best run so far on ET streets is 13.02@106 with a 1.87 60ft.
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