Transmission oil coolers: Anybody use'em?

[bgood]

Long story here, I'm wondering if I would be better served to use a cooler or go to a bigger radiator.
I am in the middle of a Vintage Air install on my 67 C10 with 350 4bbl and TH350 and I run across this note in the instructions tellin me their units won't work so well with the narrower(thinner?) radiators that came on I6 with auto transmission. Well that looks light what I got...So what would be a better fix?, bigger radiator, add a xmission oil cooler or both? The current radiator does fine right now although it runs +200 when towing my bass boat(180 degree Thermostat) so I was already thinking about a fan shroud. Anyone here had similar situation?

thanks, Bill