On a 70 Chevelle the non ac box will not cover it up. I have a 72 and I had to make one. The heater core is on the opposite side on a non ac car. not opposite side of car opposite side of box. You can buy a special blower motor for an AC car that does not have the ac box. They are all ovcer ebay and any of the chevelle restoration places have them. They are about $140