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[travellering]

Having problems keeping my Traveller happy in the hot weather. I've got a 998A+ running off an HIF38 with a stage one kit (Cone filter, intake, LCB, exhaust). I have a 123 distributor with the recommended advance curve, and timing it (idle is kind of high- 1-1.1K rpm.) I came up with about 8or 9 degrees BTDC. Advance runs out to something around 28-29 degrees. Pulled the plugs and all looked ok. The car is setup with what I think is a four core rad, with an electric fan in the fenderwell pulling air from the engine bay into the wheelwell. The reason for that being the only fan is that the plastic motor mounted fan wouldn't fit between the pulley and the radiator, even after I cut back the fender shroud and mounted the rad out to it rather than on the standard mount. I've also fitted a heatercore off a chevy Astrovan as an auxiliary radiator on the clutch end of the motor, and plumbed it in in place of the heater. It has a new 165 degree fahrenheit thermostat.
The car will run up to N on the gauge very quickly, then will creep up from there if driving around with ambient temps above 75. If I try to run safely with traffic on the motorway, it heatsoaks after about 30 to 45 minutes running around 65 mph, and will head steadily up to the hot end of the gauge. Only turning off the motor will bring temps back down, as even slowing down and running back roads doesn't predictably bring it down.
Any suggestions?

by the way, running about 20 percent coolant with water-wetter in the system...