1966 Barracuda engine mount help.

LO23M8B said

Hi guys. First I have a 69 Cuda original 318 now 340 and mounts don’t fit correctly and I really don’t know what they are from but was wondering log 318 and 340 are the same. 2nd replacing a 66 dart 273 with a 340 and going to using TTI headers

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'69 Barracudas and '66 Darts are two different animals as far as engine mounting goes. You'll get more help by starting your own threads instead of saddling on someone else's, one in the Early A Body forum for your '66 and one in the Small Block Mopar forum for the '69.
But first, use SEARCH in each of those forums, as these questions have been asked hundreds of times and your answers/solutions are already well documented- as a matter of fact, the answer to the '66 is above.