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I have a 1966 Mustang, with a straight six 200 in it, A friend of mine and I are wanting to put a 351 in it, what would be required, I know that it will be need motor mounts, but is there going to be anything else that I am going to need? Any help would be appreciated.
Thanks,

Jason
 

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The 6 cyl Mustangs used 4 lug wheels, smaller brakes, lighter springs, and lighter suspension components compared to the V8 cars. Therefore I would upgrade those items before adding the additional weight and power of a 351.
That said the 351W will bolt in with small changes to the exhaust(Hedman makes swap headers) and a drop base air filter to clear the hood, even with a stock height intake. The transmission will also need upgrading to a V8 compatible trans.
The 351C will also fit but it is much tighter and requires some special pieces to install, namely headers, motor mounts and will likely need more clearance with the shock towers.
The 351M is not even an option as far as I am concerned.JMO
 

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The rear end will need to be changed too, it won't hold up to a V8. You should be able to pick up an 8 inch rear pretty reasonably. Good luck if you want to upgrade to a 9...I havn't been able to find a correct or reasonably priced one yet-but still looking.
 
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