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Hi Dwight If the motor came in a truck it is a 390 or a 428. The only way you will be sure is to pull a head and check the bore and stroke. threr is a slim chance it could me a 361 truck motor. Pull the pan and look for an I.D. on the crank. The motor you have was used between 67-70 year. Give more info on the numbers you can find and we will try to help you. Rick Lake p.s. The first FE motor I got was a 428 block with a 390 crank in it so be carefull until you can check it out. I got screwed on mine motor.
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