600hp with stock rods is not a good idea. If you want to turn 6500rpm's I would use arp main studs, and rod bolts with a nice set of rods. I would also have it ballanced to the 28oz not the 50oz. At 6500rpm the 50oz imballance will put some strain on your mains if you do it all the time. A main girdle would be a good idea incase it lets go, it will help save your expensive parts.
Wade
One more thing  347's do not have a oil control problem. Will people please stop posting this 
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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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