I think 4 row aluminum radiators are somewhat uncommon. When I needed to step up to a larger aluminum radiator, I went to one with 1.25" tubes (2 rows) vs 1.0" tubes. It was more expensive, but it got the job done when the other one couldn't.Taurus 2 speed fans with a shroud are supposed to move somewhere around 4500 CFM if I recall right. Hopefully that radiator is a 4 row. I've got an aluminum 2 row w/ dual 12" pushers here in N. IL and isn't cutting the mustard on my mild built 429.