hi i own a 69 nova with a 350 cid i have a few questions about the 350..first has anyone had a problem with high heat from the headers in the engine bay just seems like they put out a ton of heat just a little concern....also where can i locate the block codes to figure out what year 350 i have the nova had a 6 cyl before hand..and finally for a mild 350 which gas should i use i was running 87 but doesnt seem like it gets the job done....thanks for your help