I am at a point that I'm going to pull out this 350 and just wait for the machine shop to be done with the 498 so I can stuff it in there. This freakin 350 has me going crazy trying to find the problem. The air dam is in tact, the seals around the radiator are there, put in a 2 row(1 1/4 cores) aluminum radiator , dual electric fans, timing verified. I am running a mechanical and regular temp gauges. This thing gets to 230 degrees in a hurry. The car runs fine, no misses but just can't get it to run cool. The reason I am worried is because if I can't cool this 350 , then imagine with a hyd. roller big block. GRanted this 350 has some high comp. Whoever did the engine put 305 heads on a 350 block (verified block casting# and heads) . I'm thinking this engine has got to much compression. I'm just pissed I can't drive my baby , and I just installed c5 wheels .