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I am planning to run the 351m/400 bell on a C4 behind an internally balanced 460. What flexplate and T.C. bolt pattern are you using?
 

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I use a normal C6 flexplate , 11-7/16" bolt pattern for the converter . Now you must check clearance since the C6 flexplate is closer back towards the trans .
I usually have my converters made to suit. I have heard of others shimming them with added block plates . One I did years ago I made a 6mm thick aluminium block plate worked ok and used a small block Cleveland converter.

Also need to make sure the converter snout locates in the crank. I find usually the small block 1.375" snout locates in the inner step of 460 crank
 
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