1965 dodge dart master cylinder

View attachment 1714751044[/ATTACH]I have a problem I have a 65 dodge dart gt we put a 318 magnum in it having problem with master cylander heating up and boiling over I upgraded to a duel master cylander bought a heat shield but still having problems with it any suggestions would b helpful it is just so close to manifolds had a newer plastic bowl type on there the lids heated up and started leaking put old style steel one on it yesterday and it started leaking also thanks for any help