That core looks to be about a 6" x 18"x 6"... thats a pretty larger cross sectional area for air to flow but definantly it has a smaller cooling area. Looks like it would be a jump up over the stocker and look really good to. The Spearco 4" x 10" x 9" flows 1500 cfm at less than 1 psi boost loss... just something to compare to.

Horace