Summit radiator SUM-380459

Will it work on my 1969 Dart originally a slant six converted to a built 360?

The description in Summit says it is overall 29 in X 18 1/2 which I think is a typo. I have sent a "ask question" to Summit to verify. I have seen it listed in a old catalog at 22 x 17 1/2 with a price of $315.

Has any one used this radiator. I need to cool things down and my 2 core stock is not enought. Even cruising it runs at 200+.