Like Dartsport540, I ran the ShoGun system on my old car with -10 lines and I could let that car run in the heat of Vegas for a long time. For a bracket car I expect it to sit and run for however long and not have any cooling probs. You go rounds and they start running you back to back.... you gotta be ready. I did run the ShoGun "bilge" pump and my Mirada had a radiator similar to an A body replacement piece. Dodge Dynasty electric fan with shroud.

I used to have one of those Durango pumps at work, but never got a chance to put it in a bucket and see how much fluid it would move. It was noisy, but still worked. I was kind of curious as I've heard of people using them on race cars.