If you are using a stock cobra intake a 65 will be fine. A 70 will be ok to, but if you allready have a 65 why waste money. I would get a adj regulater because you may need to do some fine tuning. And yes a new pump would be a good idea to supply the new 351.
Wade 
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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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