how hot is too hot

whats the best range for a warmed up 360 to operate at? i'm sure 180* is probably ideal for most any 70's v-8 motor, but mine starts to run funny over 170*. if it hits 180/190 it starts to bog and then if you take it out of gear sometimes the idle will run up to around 1000rpm where it would normally idle around 700-750 when in neutral.
this car has a fairly lumpy cam 233/233 @50, .512 lift on a 114 (i ithink) LSA. the cam has been degreed and it likes around 12* of timing at idle with 34* all in at 3000. MSD ignition, stock '77 360 heads with EGR ports plugged, shortie headers, holley street dominator intake, edelbrock 600 carb. it has been dyno-tuned as it sits right now but it just wants to act funny as soon as it gets a little warm at all. running a 22" stock mopar downflow radiator recored with a high-efficiency three-row core, running a flex-fan with a 1/2" spacer and a chrome cheapy half-shroud and a full-time electric pusher fan on front of radiator. the one thing i didn't do was trim the coresupport opening to fully expose the radiator. i'm covered on maybe 3" of a side by the core support.

any suggestions to improve driveability (oh yeah, it IS a daily driver.)? i mean, really the thing has been super-reliable and driveable while still making enough power to get in trouble with but i would like the peace of mind of being able to run it around even on the hottest days and not worry about having to sit in traffic. or am i just expecting too much of a souped-up old car?

thanks
-Tim