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I think I would have a reputable machine shop double check. I personally have not run Vortec heads, I here they are ok to 450 lift but there might be a seat pressure issue of the springs for a performance cam. It is easier & cheaper doing it now then later after the motor is all put together and have something go wrong.
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1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears
1948 Chevy FleetMaster Coupe, LS1, (almost done)
1950 Chevy StyleLine Coupe 250/6 3x2 Dueces
2009 Toyota Tundra
1996 Harley RoadKing
"I maybe getting old, but I can still burn rubber with the best of them"
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