[pjdutton]

Have read about the 1975 and newer blocks being weaker than earlier ones.I have 2 blocks that need rebores,one is a 75 400 and the other is a 71 350.The 400 block is a 500557 casting and I am not sure which one to have the money spent on.I`m only looking to make around 350 flywheel horsepower,nothing special.Any advice would be helpful.