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I'm putting a c6 out of a 71 Torino GT 351 4v behind a 70 351c 2v. A Fmx was in the car and the flexplate has torque converter holes that are 11 1/4". The C6 has torque converter holes that are 10 1/2. All I have is the Flexplate for the FMX and it is not going to work. I know someone out there has done this before and was wondering what flexplate you used to match it up.
 

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The convertor in your 4V C6 is the "small" CJ convertor. It also has a higher stall speed than you old FMX convertor. You have two choices. Get the flex plate for a 71-73 351C 4V with the smaller bolt pattern , OR a convertor from a later C6 ( 351M/400) that will bolt up to your FMX flex plate and have the same stall as you used to.
Randy
 
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Pioneer part# for the 351CJ flexplate is FRA-220, which replaces D1ZZ-6375-C. Torque converter center to center bolt pattern on this is 9.5", so re-check your measurements.

 
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