Classic/Antique Car Repair: Source of blue smoke from tail pipes, edelbrock carb, moth balls

Question
I have recently taken a 69 Camaro with 350 small block out of moth balls.  It seemed to run pretty well with its new Edelbrock carb a few weeks ago while going a few miles to town.  It has since gotten a new exhaust system, new GM fuel tank and AC fuel gauge sender in the tank.  Last night while driving to town to fuel up the new tank, blue smoke started coming from both exhaust pipes especially when shifting the 4 speed.  Do you think the problem is old valve seals or something else?  The car had only been started periodically since 1988.  Your help would be greatly appreciated.  Thank you.

Answer
  69 a good year, for chevys also woodstock,I went it was wild. well blue smoke, I hope that you gave the engine a  oil  change and filter and I would use a good brand oil at a 30 wt. or 4 cans of 30 wt and one can of 10-40 and add a can of s.t.p. oil treatment.  Prior to street use than again after apx. 500 miles as you must get all the crap out of it and replace it with good new clean oil so do that if you have not. And yes it could be the valve seals but most of the time it will foul the heack out of the plugs and the smoke is more on the white side as blue is more twords the fuel mix/ too much fuel or un burnt fuel so re adj. the carb. and change the plugs than see how it is, this should help a lot . OK and if the engine has been sleeping for some time I would take it easy for the first 500 miles till you re-change the oil and a new oil filter you want to get everything nice and lubed up with the new oil.
good luck let me know how you make out ok
Roger jm W..