The hose I have is -6 (3/8") Russell Twist Lok, NHRA approved. It's made for this type of thing. Trans is a 904. The fittings are all -6/AN type.

The main concern I had with running it next to the oil pan was where it passes by the converter. In the event of something coming loose, I suppose severing the cooler lines might the least of my worries but it does not sit well with me for that reason.

The exhaust is a pain, it really is. Everything is so tight along side that frame rail on an A body, you have to do a lot of imaginative routing to keep things away from heat.