Brake line help

[atm70chevy]

I have a 1970 shortbed stepside that someone converted to disc brakes before I bought it. It was a certified basket case when I got it and the brake lines that were on it were held together with zip ties and hose clamps... I took all of them off and chunked them a long time ago thinking it would be as easy as opening a catalog and ordering replacement lines and then just bolting them on. I'm pretty sure it has the stock cross member as the tabs for the brake lines on the back side of the cross member. I have searched the forum and have read so much that I have now confused myself even more. Can someone advise me as to what brake line kit I need to order. Do I order one for a 1970 and get the conversion rubber hose from ECE or do I need something different. I bought a complete brake kit a while back but after trying to install it and looking at photos on here, I'm pretty sure it is the wrong kit. If someone could shed some light on this I would greatly appreciate it. This is the last thing I need to tackle before I can finally get it on the road.

Thanks for any help y'all can offer.
Anthony