What's the purpose of a 3 row, if the 2 row cools better.
A few months ago I was shopping for an ACP radiator for the 302 in my '66 and emailed them a similar question.
Besides the lower price, any reason to go with the 3-row over the 2-row?
The most important factor these days is the total amount of surface area that can transfer heat. Our 2 rows are about 8-10% cooler than our 3 row because of the really big tubes.
Our 65-66 radiator has the exact same brackets as the OE radiator. So, you will need those four little "Z" shaped brackets/spacers for your fan shroud, just like the OE had. Stock cap will work, but you can go up to 16lbs if you wanted to.
If you are just using the car as a daily driver, the 3 row may be beneficial during "idle" times. Because the coolant will not flow as fast through the 3 rows and thus allowing the heat to dissipate a little longer.
Also, please remember that our MaxCores are thicker than OE. So, just make sure to check for overall clearance and use a fan spacer if you need to. V8s should have plenty of room. The 6 cylinders are very tight.