What to know before adding AC

Hopefully, you have a small-block V-8 since that is what the kit is for. They show a parallel tube condenser, which is ~30% more efficient than a single tube (like factory used).

Cooling system shouldn't be a problem unless you have a wild cam and over-sized carburetor, since both make the engine inefficient at low rpm. If you do have problems, you can switch to a new aluminum radiator (~$150).