With you having done a conversion, the attached PDF on GM Mounts in the 80's may or may not help you. Note the various types of mounts available for the Chev. car series. When I worked in the transmission parts industry and a customer ordered a mount there were a number of questions we needed to ask. Year and make of course, plus engine size and transmission type and ask him for a description of the mount. I'm surprised that the G Force didn't supply you with a mount as part of the conversion kit.
Hope the attached is of some help to you.
I appreciate you taking the time to post that but from what I can see it looks like I have the correct mount. The issue I have now is it doesnt fit flush to the case due to the casting. It looks like Im going to have to trim the mount a bit at one corner. Better trimming the mount than the case. If you look at my other thread from today you'll see what I mean.
The cross member didnt come with a new mount. It has a single slotted hole. I used the same style with an Energy mount on the TH400 in my 81 Malibu without any issues.