A machinist budd of mine suggested installing a new timing chain and gear set. He suggested Cloyes kit that has the advancement/retard built into the gears. This is the roller kit I am going with. Summit number CLO-9-1100. Also got a cool aluminum cover - This will be used on my 90K5 with the factory tbi. He said to try the 4 degrees advancement and the should help with the bogging down off of idle. Anyone have experience with this? He said it should really boost lower end, but at the sacrifice of gas mileage.