Hi Dan welcome to CHR. The C6 is a refined version of the Cruiseomatic. I'm not certain if the converters are the same tho. Comp has some nice selections on cams. Just watch your lift over .525 with the non adjustable rockers. If you go with more lift it's time to get adjustables. Match the valvesprings to the cams lift and pressure specs. Most will list the proper springs with the cams. The blue smoke could be from valve seals or valve guides. Once you get them apart it's easy to see and check for loose guides and hardened seals. The oem seals are just rubber and become hard over time. You'd want to look into headers also. Stock exhaust main's are a cork. There are the cast iron oem headers both short and long versions. They do run on the expensive sdie tho. Hooker, FPA and Crites all sell Gal headers for reasonable money. You can look for used also. Maybe look at the exhaust too. Without spending a ton of money cam and springs, headers and exhaust are your best bet.