If you have not bought one yet get the 70mm, it will not harm your performance on a 351. It will give you some to grow if you do some mods like a head and intake swap. I THINK that stock is 60mm.
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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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