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I am currently doing this swap, and it isn't all easy.
I went from a 289 C4, to a 390 C6, numbers aren't a factor for me, i just want something that runs and looks good.
The rads are different. Engine mounts and frame mounts are similar, but need to be slightly modified for the big block. I needed to find a transmission crossmember for a C6. driveshaft for a C6. Exhaust manifolds for the Mustang/Cougar/Failane. Power steering brackets for Mustang/Cougar/Failane. Cylinder heads for the same.
Items like the pwr steering brackets, heads and ex manifolds will all fit any 390.........but they won't all fit the Mustang body, and they need to.
I live in Canada, there isn't a lot of places to find used Mustang parts that are affordable. Learn from others that have been on the same road, let them make the mistakes and then ask them for the answers.
 
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