Sure sounds like my son's 455 when we installed his XE284 one tooth off. Ran fine but had little power. Was off over .6 and 5 mph at the local 1/8th mile track. Last time I installed a cam after midnight.
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1967 Firebird ragtop, 464, Weiand 8-71, ported 6H heads, Hyd roller, 4L80E, paddle shifter, Moser 9", Cal-Tracs, Vintage Air, Corbeau seats, 13"/12" disk brakes, Hydraboost, electric cutouts and M&H drag radials. 
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