Going down this path myself - gotta find a local carb guy - think mine is off
Been chasing the running hot issue for over a year. Made several changes & none of them made significant changes, but there there has always been two constants - Timing and Carb setting and I have no idea what either of them are...
Initial set up - Skinny Flex Fan w/ full steel shroud, triple pass rad from WH, stock water pump with same size pulley as crank, 180 deg Tstat, 50/50 mix in rad and Vintage Air A/C condenser in front of rad
Ran 180 deg down the road, but quickly crept to 230+ while sitting
REV 1 - added two 12" pusher fans up front
Ran 195 deg down the road, crept to 215 while sitting-but not as fast as before
REV 2 - removed A/C condenser (considered remote mounting it if this worked)
Ran 180 down the road, crept to 210 while sitting
REV 3 - (Current Set up-finished Sunday) Swapped flex fan for rigid fan from WH, removed pusher fans, put A/C condenser back in, added Royal Purple Ice to 70/30 rad mix. I reluctantly had to modify core support for this - seems rad is mounted almost straight up and down and engine has a slight tilt backwards so had clearance issues at the bottom. I removed lower rad supports and cut off "lip" of lower part of the core support in front of the rad then re-attached rad supports to now flat area on lower part of core support and reinforced it with 1 1/4"x 1/8" Flat Bar. This almost matched the rad tilt to engine tilt and now the fan fits and the condenser still fits between rad and core support.
Now runs 175 deg down the road, slowly creeps to 200 while sitting - the best so far, but don't like it and won't wheel it like this
Engine is a mild build 331 and the builder failed to put a timing pointer on it-the mech who installed it didn't catch it until he tried to time it so timed it by ear.
While doing the work above I added a Scott Drake timing pointer to the drivers side of engine (couldn't see the stock one on pass side even if it was there because of water hose) and found TDC & put a MSD timing tape on the balancer. Now have to get a light and time it.
Hoping for improvement when timing and carb are right cuz I'm getting close to the last straw!