what do I do with these lines now

There's a Carquest near me that "rebuilds" hydraulic hoses with new parker hoses. I bet they could put new rubber hoses on them or make all new lines possibly, I've never asked about it, just noticed the sign the other day when picking up a couple of drums that I had cut in their machine shop. Parker hose is very good and makes A/C hoses for the major car manufacturers.

If you convert to R-134 A, you should get a new receiver drier, and replace all the o-rings wth HNBR material o-rings (usually green) as they are more compatible with the R-134 A and the PAG oils used for the compressor.

If you are also replacing the foam seals in the HVAC unit, then I would also recommend finding a new foam that is resistant to PAG oil.

The gen 1 LH cars had bad evaporatorrs and when they were replaced, sometimes the PAG oil from the evaproator would get on the foam seals and eventually eat them away. Then the air would go AROUND the evaporator instead of THROUGH it, and performance would be reduced. Then they would have to go back in and replace the seals with PAG oil resistant ones...

I see a few of them around here in summer when it is really hot, driving around with the windows open, and figure it's one of the bad evaporator or bad seals affecting the A/C so they have to drive with the windows open... It costs over $1000 to have the evaporators replaced, and some of those cars aren't worth putting that kind of money in today....