Are you ready to start a war?? OK Here we go...and this is straight out of the newest 5.0 MM&SF mag. The advantages of the 351 are straightforward. You get a better, more powerful engine with bigger main caps and a better rod to stroke ratio and taller deck. The disadvantages are obvious. The weight and the $$ needed to be spent on the swap. The disadvantages of the 347 is that it's a perceived oil burner, has limited growth, poor rod to stroke ratio, etc. hope this helps 
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Red 1993 GT Street Machine
Best E.T. - 12.41/Best MPH = 108
Engine is a 1969 351 block w/393 stroker kit. Dynamic Roller Myte C4, 8 pt cage. Edlebrock Performer heads and Victor Jr. EFI, FRPP 30lb injectors & Cartech fuel system. MSD ignition. Sothside Machine bars & Sub-frames, adj. upper's, 3.73's, Koni rear shocks, much more
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