It may look like TDC, but there is something you are forgeting about. The piston may be at the top of the bore, but the crank still needs to turn a few degrees (dwell time) to be at exact TDC. you may be off as much as 4 degrees.
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79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor
93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe
Ricer hater's club member #49
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