I tell this same response to alot of people who ask about getting a Z of their own.
If the car is going to be your primary transportation, i strongly suggest that you do not get it. If you do get it, and want it to be primary transportation, be prepared to sink some money into it to bring it up to at least "sub-par" as a daily driver status.
Brakes, windshield wipers, lack of power, and 4 decades of aging... leaves alot on the table for something you are going to count on every day to get you to and from your school/work/etc...
I always suggest these cars as secondary toys, weekend pleasure cars, and something to be taken out as a treat to be enjoyed. It allows you to take your time on making repairs or alterations, so that you do not rush and make mistakes. It makes you appreciate the nuances of the car, rather than grow to hate them day in and day out.
If this is not your primary car, I say go for it, do a swap, restore it to OEM, or anything else, it’s a project at that point, and that’s what they require, time and planning. If it is to be your only car, daily driven, I’d suggest going through and inspecting/revamping all the older systems of the car.
When rationalizing spending money on things that do not involve making yourself faster, keep in mind that you are driving a beer can on wheels, and that you are one of the smallest things on the road.