I too used a Champion 2 core from eBay 189 to my door. fit fine on my 65 dart just had to relocate one mounting hole on the dr side flat flange (no big deal) and use an early iron pump for the dr side lower nipple. a 318 DD sure ain't gonna test its cooling capacity but I dont see an issue. reportedly there are (were) issues with flatness and poor welds so you'd wanna check that right off the bat and iirc something about a problem adding a schroud & something about the cooling tubes not being as big as some. I think there is a member who sells em & guaranteed satisfaction. the top tank is square & the alum needs to be painted (imo) cuz it dont look right. Speedway mtrs has alum rads for cheap too (never used one & not sure who makes em, not in house tho). Short version: I'd get a 3 row core version with nipples on correct side/check it over/add a schroud/call it good