Tips for tightening transmission line? - 71 Dart A904

I replaced the two lines from my A904 to the radiator, but in the process, I ended up cutting the old one in order to get any type of tool on it. The clearance was so incredibly tight.

One of the lines is in an IMPOSSIBLE spot to reach. I've tried short wrenches, extra long wrenches, etc. and I CANNOT get it to tighten up to the point where it's not got a slow leak.

Any tips or advice on how to get to those lines? I'd be really cheesed if I have to drop things down just for those stupid lines.

Thanks!

-Daniel