hello, I have a 1969 chevy nova the i just installed a rebuilt chevy 350, my problem is that i started the car for the first time. The car was running at 1500rpm's for 15 min to break in the cam, when i notice the #8 exhaust tube in the pass. side header glowing red, the car was back firing from the exhaust from time to time, i checked timming, wiring order and everything is fine, after the car ran for 18min the lower rad. hose blew off from the water pump. So i shut the car down. iam out of ideas. Stock 350 with a dual dual plane weiand intake, 600 holly, headers, HEI, MSD 8mm wires, and dual exhaust with 40 series flowmaster. thanks