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Las Vegas, NV
I agree with globalhelper the iac needs to be adjusted correctly or/and you may have vacuum leaks. I see that you are in Vegas, if it will help bring the car down to the shop and we will look at it free of charge. Without seeing the car it will be hard to give you any better advise.
Sounds like the lower end went out. Worn out piston rings, blue smoke is burning oil. It burnt out the catalytic converter. You can rebuild lower end because you already rebulit the top end. Sometimes rebuliding the top end doesn't fix the problem. If you need additional information, please contact our shop at 702-384-7636. Thank you!