[l79m20]

I know that the perch for the passenger side motor mount must be the one used for the 292 and must be moved forward a bit. I have done this in the past but today while getting ready to install the 292, the motor mount bracket that mounts to the block will not fit . I am attempting to use the brackets from the previous motor a 250. Does the passenger side bracket from an original 292 have to be used also? Thoughts