I went with a 4 core Forklift rad under the header panel (18" wide 16"tall), used a Derale 14" duel speed Pusher fan (1700cfm Low speed, 2300cfm High speed) and have 2" of clearance in front of the water pump.The Engine never gets above 190degrees in traffic on a summer day in the mid 90F. on the highway it sits at 180F. I made a new latch support brace and didn't cut the top of the header. Granted I'm running a 302 but a 318/360 is about the same length.

What about a newer 5.7L Hemi as you can get a stand alone engine managment kit so you could also go with a ZF 8 speed tranny. not like there isn't a crap load of those at the junk yards.