351 M is for Modified 400 , cross between clevland and big block.
heavy and hard to find performace parts find a 351 W 71-74 block 69-70 have diffrent deck heights and are a little diffrent but stong if you get a complete one. heads block crank ect.
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89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .
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