Being an ex Ca car it may never have had a windscreen washer set-up. An easy and essential item to fit IMO. Use a twin "owl eyes" jet in the hood and a later type combined tank and electric pump. The later can be replaced by a cheaper generic type with the pump in the side of the Tank if you like.
New wiper arms and blades are an investment. Sloppy and worn old ones don't work well, they're not brilliant in the first place, so on a wet and windy night you need all the help you can get. Maybe check out
http://www.marinco.com/en/products/wiper-systems These are for boats so have to cope with a lot. Adjustable arms not ideal but if their bladed fit a suitable standard arm that's good. They have 11.5" and 12" blades which should work well. Some people use 10", but these leave quite a bit of the screen un-wiped.
Update us as you go and tick off the work done.