Can still use original hoses.
Drain the oil from the compressor and put a PAG oil in it.
Change receiver drier and charge fittings.
Regas on R134a and away you go.
I put 550g in mine and it's just right. Head pressures are good as well.

BUT BEWARE.... as of July 1 A/C regassing WILL be going up. There is a new type of gas on the market and buying prices will increase by 300 to 400%. R134a WILL be getting phased out.