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Looks like the 3 row is 221.95 and the 4 row is 375.95 for your 68 302. Just type in radiator in the search section, and 1968 in the year. Try shopping around at other vendors such as NPD, etc. We have a ton of vendors listed in the FAQ section. http://www.texasmustang.com
Go for it. The 3 row is much superior to the old 2 row. The difference between the 3 and 4 row, is that the 4 row holds a little bit more fluid, but the fins are closer together. The 3 row should work out just fine for you.