/6 to SB motor mount questions? Schumacher Alternative?

64-66 "K" members are the same, whether V-8 or slant six. You can use the stock 273 engine brackets to install a 318 in a slant six 64-65 "A" body. You will need the "dropped" drag link. 64-65 had different drag link depending on slant six, or small block. Most 66 used the dropped drag link, regardless of the engine. Also if the slant six car ever had the drag link replaced during it's lifetime, it might have the dropped link. You need to check. With the Schumacher kit they raise the engine higher then original, so it is not necessay to change the drag link.
Just a FYI. The spitfire type headers that Laysons sell, you need to order the correct ones depending on whether the stock mounts are used or the Schumacher kit.