Swap 904 to 727?

Thanks. One other thing I am dealing with on this conversion. Finding the rubber motor mounts is easy but I can not find engine support brackets to fit on the 78 318 then bolt the expensive motor mounts to them. The only thing out there is that expensive kit from schumader. Am I wrong?
Got 727 yoke. Going to try to use the 7 1/4 rear end for a while. It is just going to be a street driver anyway.