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I got the motor and transmission that i plan on installing into my 87 mustang. They are a 351m/400 and a C-6 transmission. Iv read alots on a 351M/400 sounds like fun right. The only thing i dont know are will a 351c swap work? Like are the engine mounts the same can i use the 351c swap headers? im worried about the over 1 inch deck height will they still clear? dose anyone know if someone has done that swap before? Iv done the leg work on plans to get the motor to be a monster. Its just now see if thing will fit. lol i dont care how hard it is. The harder the job the more i will enjoy it when its done. If it gose right in and dont cause me hell, its to small. Thanks Agine you all rock
 

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A 460 would be much more worthwhile than a 351M/400 swap and due to similar motor mount locations and overall dimensions nearly as easy.
 

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The 351c pan will work but the mounts are totally different than any other Ford V8. Headers...you're on your own. The M blocks are as tall and wide as a 460...much taller/wider than a cleveland. You'll probably have to have custom header$. It'll fit...whether it's worth it or not is up to you. Basically, where a 400 fits, a 460 will go just as easily...and in this case, probably even easier.
 
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