Do you still have the brass restrictor under thermostat housing?
While cruising the pusher style fan can obstruct air flow, is there a reason you went pusher instead of puller?
FWIW - my 408 with a way too small radiator runs 190 - 195 cruising and goes to 210 stop and go traffic but I am convinced it is because of the high stall I run (use a radiator with a tranny cooler built in and have not installed an aux cooler yet) so when stop and go or slow crawl it heats up fast.
While cruising the pusher style fan can obstruct air flow, is there a reason you went pusher instead of puller?
FWIW - my 408 with a way too small radiator runs 190 - 195 cruising and goes to 210 stop and go traffic but I am convinced it is because of the high stall I run (use a radiator with a tranny cooler built in and have not installed an aux cooler yet) so when stop and go or slow crawl it heats up fast.