Seems the TH350 in my '29 coupe has been cooking fluid lately

After about an hour of driving in traffic, I get a mild shudder in 2nd and 3rd when I give her the beans

I don't have a proper gauge, so I checked the fluid with a temp gun after cruising last night and saw 210* off the dipstick

I'd like to install an auxiliary cooler, but space is pretty tight along the rails and there's zero room near the motor (it's possible, but not without looking like dog$#!t)

I could probably get away with adding a slimline fin style cooler along the rails, but doubt it would really do much to aid in cooling

I figure a proper cooler with a fan mounted under the trunk would do better for cooling, but will I have any problems with the pump pushing fluid that far back