I've towed some pretty big stuff with this, and never had a cooling issue. We don't have a lot of hot days up here. I'd like to do that cooling mod anyway, but I'd need a hi-res photo with circles and arrows to point the way. I bet there's photos on here, but I haven't found'em yet.
My eventual goal is to have a rebuilt engine on a stand ready to drop in, but I'm not there yet. Maybe next year I'll get there.
In the mean time I need to get this beast back on the road ASAP, and I know very well if I start doing extra stuff "while I'm in there" this will turn into a multi-year project like the '94 did. I lost momentum on that one, and it's been a couple years since I made progress. I have way too many projects, and I need to be careful not to start more. If I had finished that '94, I wouldn't have to rush this one...