A body radiators

I use ECP radiators ECP | No Gimmick Cooling

They have detailed drawings and specs on their site of all the dimensions, fittings, etc. I also like them because they use the newer super-wide 2-row design as opposed to the traditional 3-row which is less efficient. Prices are pretty good as well. I have one in my '70 Duster and another in my '72 D200 pickup, they both fit great I don't remember having to modify them very much at all. Even the stock shroud bolted right up. My truck has a mostly-stock 360 with 4-bbl and headers and just to see what would happen I floored it for 30 seconds straight pulling my Duster on a U-haul trailer (~5000 lbs) up Monument Hill on I-25 and my AutoMeter temp gauge barely moved, didn't even get to 210 degrees (has 195 degree t-stat).