1966 351 V6 Magnum in a 1965 Suburban. Has a Powerglide transmission. Use this to pull my car trailer so it gets gets worked a bit. Has factory Harrison Radiator that is getting pretty green in places. Before I have this radiator re-cored (getting to be no radiator shops around) I was wondering if there are any "good" replacement radiators that fit. Need to be "good" quality and dependable. Aluminum? Thanks!