did you change the setting on the tach, if its still set up for a four cylinder, your eight cylinder engine will be running half of whats shown. Check the back of the tach, it should have a dial with setting for 4 cyl, 6 cyl. 8 cyl, 6 poll, 12 poll. you need 8 cyl, check the accuracy with a shop tach, after that you will probably still need to reprop, I'd guess a 19p, you want that motor to turn around 4400-4800
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