I hate to be the guy that advises against this... but I would use the correct equipment for the task. I have used the Van Norman, Sunnen and Rottler CNC F69A style machines. I always finish them a little on the small side and finish with an align hone after the bore. If you had a scrap block lying around then maybe. One mistake and your block is not useable.
There may be some here who have done it, but my 35 plus years as a machinist doesn't have the warm and fuzzy about it. You may be headaches ahead to find a shop. You are not far from Scott Williams, find out who does his machine work.
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66 GTO Nostalgia Super Stock/Street Legal Car
421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99
Multiple NSCA/NMCA World Champion
66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles
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80 Trans Am Black SE Y84 W72 WS6
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