When I seperated the water crossover, the saw blade left a faily wide slot (kerf) where the metal was cut out. I then ground on the new cut and removed more metal. As you can see from the picture all of that gap was taken up in correctly aligning the ports. They weren't very accurate from the factory.
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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