FHHuber has a good method for mounting, and I'll probably try it next time.

I usually clamp the engine to the mount, then use a piece of music wire with a 90 degree angle bent into one end. I heat the wire with a small torch, then press it down into the engine mounting lug's holes. Leaves a nice divot in the "plastic" mount for the drill bit. Doesn't work very well on aluminum mounts though.
Dennis-