which would you choose? radiator

Don't do a 3 row. Especially with only .750 tubes. 3 times .750 is 2.25. If you have a 2 core with 1.25 tubes you have 2.500 tube area. More tubes isn't better. In fact, it can be worse.

I used an ECP radiator. It want a perfect fit, but it was Ok. It cools like jack the bear.

There is a forum sponsor on here. You can find them at the bottom of the forum page. Had I known about that company, I would have used their radiator.

Again, even though I'm being redundant, it's all about coolant flow. The least amount of restriction is important. Another reason why a 2 cores is better than 3 or 4 cores, is because there is less turbulence above the cores. Less cores with bigger tubes creates less restriction.

Also, you need a quality water pump. I use the Mildon because it's cost effective and it works. I've heard the Flow Cooler brand is good, but I've never used one so I can't say.

Make sure you run the water pump at least at crank speed. 8-10% overdriven is better than 1:1 and make sure you use a quality thermostat. I use the Stewart Components thermostat.

It's all about coolant and air flow. Keep your restrictions as minimal as possible.