HEY PAULL SOME OF THE EARLY BIG CHRYSLER CARS WITH THE BIG ENGS HAD RAD WITH THE INLET AND OUTLET WHERE YOU NEED THEM BUT THE NECK SIZES WERE TO BIG WHICH WOULD BE EASY TO FIX, AND THEY WERE BIG RAD SOME WERE 4 ROW BUT MOST WERE WERE 26-28 IN WIDE AND AROUND 20=24 IN TALL THYE WOULD COOL EASILY YOUR ENG I WOULD JUST SCROUNG AROUND THE WRECKING YARDS UNTILL I FOUND ONE THAT YOU COULD MAKE WORK, AND HAVE IT CHECKED , MOST OF THE GM PROD RADS WILL BE CROSS FLOW AND THIN BUT IF YOU FIND ONE THAT IS IN GOOD SHAPE AND WILL COME CLOSE TO FITTING GRAB IT THE CROSS FLOW WILL COOL JUST AS GOOD AS A DOWN FLOW RAD ALL THING BEING EQUAL ,, ONE OTHER THING WOULD BE THE ALUM, RAD FROM JEGS AND YOU CNA GET THEM PRETTY BIG UNDER 200.00 FOR THE GM CARS WITH DUAL 1 IN ROWS THAT ARE CROSS FLOW , THAT SHOULD EASILY KEEP IT COOL JERRY