the attachment bolt holes are the issue -- you need to keep both the front pulley and the flexplate together as they are weighted for a 400 SBC motor -- i do believe the converter will bolt up to your 400 the only thing you will need to check mixing parts like this is -- ( with the converter in place and the thans bolted up to motor you need at least .75 to .100 thousands travel ) back and forth on the converter with the two pieces bolted together -- if the converter cant be pulled back and forth when bolted together don't do it something is wrong -- hope you get what i an saying -- and the holes for converter to flexplate need to match up as well --- jz
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