You are not in a position to buy and restore a classic car. That takes having a garage that you can work in with no restrictions - meaning you'd probably have to own a house, not rent one because leases usually prohibit the kinds of activities required to restore a vehicle. .
Restoring a car also takes having the tools, knowledge, skills, experience and MONEY, which you cannot finance. And, most important - you need a LOT of free time. You do not possess any of these things in sufficient quantity to be practical at this stage of your life. Buy the newer vehicle and wait until you are in a situation allowing you to restore a car properly, not on a shoe-string.