So I'm thinking about pulling motor. It's has a noisy lifter tapp I believe. Oil pressure is good on start up but drops over time of driving to 20 psi. Idles differently all the time. Some times after a long drive when putting in park car idles up high to like 2grand.Smokes some times on start up. What's a good place that won't break the bank and what has any one spent on a good rebuild.? Thanks for any input.