331's have the oil ring in the ristpin area as well. And yes the rings are a little tighter on the 347 but that is not a issue. The only advantage that a 331 has over the 347 is in a power adder app. There is some more meat on top of the piston on a 331 to handle the abuse a little better.
And yes nitrous is a replacement, but i can put nitrous on my lawnmower.
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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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