Just got my 59 going. Also has 270L6. Would suggest a complete overhaul of carb. There are some very small air passages in these units. Be careful to carefully clean the entire carb. Install a new kit and besure to set float height. Start with idle screw at about 1-1/4 turns open, then adjust idle after warmed up. Also check heat riser butterfly (exhaust manifold)to be sure it is opening after warn-up. Good Luck
