I'm looking into the aluminum radiators as well (direct bolt in or very minimal fab). Looks like the best price is for the Griffin from Summit for $545 part #GRI-7-576BC-FXX
Link ->
http://www.summitracing.com/parts/GRI-7-576BC-FXX/
Probably same one that Duke bought, Duke can you confirm?
B&B sells theirs for $750.
I'm going to order the one from Summit and it should arrive on 9/23. I had a 4 core brass before, running a 351W with mild came & 16" puller fan. Got up to 215 in summer at lights. Will let you know what difference is and weight as well.