I have a 73 with a 327 with a short water pump and Don Hardy mounts.
The core on the Monza radiator is two 1" tubes so they say it is 2" thick but the tanks are 3" thick.
My fan(Flex-a-lite 1317) cleared the 2.5" core with the 3" tanks, not by much though.
The best way to put it together is to have the hood off and put the radiator in last, or with the hood on and rad in, put the fan and the pulley on the water pump while it is off of the engine then put the water pump on last.
A dual pass is so named because it flows through the core twice, this is slightly more efficient than a standard crossflow.
You should be ok with the 1" tubes for a 327, my car had AC and some day I want to hook it up so I got the 1.25" tubes.
a Flex-a-lite 1317 steel fan with no spacer has almost all of the blades towards the pulley, so much so they hang into the second groove.
That is the setup I had, I am currently relocating my radiator an inch or so forward since I had the engine out of the way.