Another noob question, motor mounts
 

My 87 13b has side mounts similiar to a conventional pushrod engine. I have seen in pics a front mount w/4 mounting studs from the front of the engine. What engines (years, models) have this front mount system? Can I use just the front of the case on my existing 87 13b? The front mounts would be ideal for this conversion.

Thanks.
Tony