I've got a 68 Sport Fury that had 3 broken pistons in the original 383 H.P. engine, so I put a 76 Dodge Monaco 400 H.P. in it till I get some pistons for my 383. I've got a vibe above 55 mph. I noticed the flex plates were different when I changed the engines, so I tried to keep the same plate with it's motor. Someone told me that I would need to use the 400 torque converter instead of the 383 convertor. They are both high performance engines. So, does anybody know for sure about this, and are there part numbers for each piece and how do I find out what they are? And it's not the u-joints. lol
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