71 Mach 1 Boss 351 or No Boss

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Djustham

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Sorry to all that I have posted about this before but now I have more information lol. It has a 2" harmonic balancer and I have attached pictures of the guides and lifters as I think this tells a story as well? Havent been able to find the id plate bear the starter as of yet. What do you think, Boss 351 or no Whats the next step to identify without taking the motor part? Thanks for the help.
 
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The guide plates are Ford parts for sure, can't say about the rest of the engine. A borescope down a spark plug hole might tell you if the pistons are domed or not. You might get a look at the main caps through the oil pan drain hole, I think Hemi has already suggested this. Chuck
 
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