The 200 6 was engineered the way the factory installed it---how old is it and what are you trying to do with a 6?? An old 6 is tired---can't you leave it alone and enjoy whatever life it has left in it?? A 2 barrel is like fertilizing an acre with a fart--it will do no good. Isn't gasoline getting a little expensive to be fooling with cars and burning more gas??
Chris, even if you had a four barrel or dual four barrel 289 it would be a weak sister. I don't want to sound harsh but in the sixties I dispoesd of every one of them I ever met at the drag strip or street. I only had a 65 Chevelle with a 350 hp. 327 with 3:73 gears and a wide box Muncy 4 speed.