The 351 is stronger and more powerful, plus it can be stroked beyond 400 cubes. Go with the 351. You'll be happy you did. I am. If you do decide to do it and need help don't be afraid to shout. I just got "done" with mine and I love it. If you're on a tight budget than it might not be feasible, the 351 swap is a little more expensive, but the results are better if done correctly. There is a fiar amount of research that you'll need to do but that's half the fun 
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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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