65 cuda front carpet doesn't fit-need thoughts

After doing a 4sp conversion on my 65cuda i ordered new carpet from Legendary. Should the carpet be molded for the shifter floor pan or do you have to heat it and shape it. Even if i do that it will be to big on the rest of the tunnel. The carpet is tagged 67-76 a-body. After contacting Legendary and (Trim Fit) the maker of the carpet they say all the early a bods used the same carpet and because I did a conversion they can not gaurentee it will fit correctly. I would actually have to cut the carpet to make it fit. Any help or thoughts appriciated.