BRP MuscleRods Mount Design

[eric8]

Just curious if anyone has had experience with or paid attention to BRP's LS engine mount design for the 64-72 C10? It is my understanding that their design replaces the factory perch that mounts from the frame rails to the crossmember, replacing it with a much cleaner mount that goes directly from the engine to the crossmember. This would be great for freeing up space for headers/etc. However, I noticed that on the 64-72 C10 design specifically, the frame side mount seems very small with only one bolt hole? Most of their other designs (the 73 and up c10 specifically) seems to use at least three bolt holes and a much larger mounting surface on the crossmember mount. Any ideas why?