Hey Guys I know this has been asked in the past but I'm didn't find anything in tech archives. I have a 64 Plymouth with a 505 Indy EZ heads 10.75 to 1 comp. I have a northern radiator (20-1/2 by 18) in it now with a 16 in electric fan. When I bracket raced car with a 440 I ran electric water pump drive and it worked ok for track. Now with new motor I'm running same radiator with mechanical WP. I have tried 7 blade fixed fan and electric. I'm trying to street drive this now and it doesn't work at all. The temp just keeps climbing. My question where would you start. The radiator has 2 1 inch rows so I don't know if a new radiator would help. I don't mind spending money if it works. Any advice would be great. Thanks Mike