a727 lines

I am just to the point where I am thinking about running the trans cooling lines.

My main concerns are about making it work vs pretty. The exhaust is close to the 727 and the headers take up a bunch of room in the engine compartment. Bending a line to navigate that maze will be ugly.

I have read that you can use copper gas line but I really wonder about that...steel or rubber sounds more logical.

I was thinking about starting off with steel line on either end but continue with hose from trans to cooler...flaring and double clamping the line so it will not blow off or leak.

What size line should I use - 3/8ths or is there a better way to do this ?

Can you buy pre made that fit in nice and easy ( does anything ?) ?

Thanks
ian.