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I am sorry, but I have seemed to have lost my place. Last night I asked what is the biggest motor that would fit into a 72 Cougar Convertible and what trannie will I need to use it.
 

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Well I'll take a stab at this.I believe the 460 will fit in the 71-73 chassis and a C-6 is probably the tranny to use just have to ensure it has the correct bell housing. Also not sure about motor mounts for that chassis. Just my best guess here.
 

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Yes, the 385 series will fit into the '71 - '73's. That's the 429/460. Since they were optional, you can get everything to bolt it all up. Trans I would go with a C6 if an auto, and a big shaft toploader 4 spd if manual.
 

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