The1User,
Clam shell is inferior heat sink/cooling fins compared to this mount:
See part # ACC3929 for $3.99
http://www.maxxprod.com/mpi/mpi-29b.html
You can trim the corners next to motor mount a bit or shorten it with a hacksaw as needed.....very easy and quick.
See Mopar's pic in last page.
Gryphon