Sorry to keep asking for help but I am so frustrated with this motor. My engine still continues to smoke some out of the drivers side tailpipe. This is a newly rebuilt FE390 with about 400-500 miles on it. I'm guessing since the odometer is inaccurate. Engine is bored .060 over, has a race cam of unknown specs, solid lifters and heavy duty valve springs. The valve seals and guides were replaced but who's to know if I have a possible failure. I just last week re installed the Edelbrock Performer intake thinking maybe I had an intake leak from using the cork ends instead of the 1/4" bead method. The plugs all look clean with maybe just a little oil on the threads of 5 and 8 plug. Compression is roughly 130 on all of the pistons on that side once the engine is warmed up. That's me using an older compression tester and only taking out 1 plug at a time using no oil in the cylinder. Is my best solution to do a leak down test and would it indicate for sure where the problem is? I am wondering about vacuum and my pcv system maybe having something to do with this problem. I am measuring 13 on my vacuum gauge when the engine is warmed up and idling at 1000 rpms. This is a good reading I thought. Do I have the right pcv valve? I have it on the passenger side and a breather on the drivers side. PCV line is connected to my carb on the front where it's supposed to be. All I know is when we first got this engine running, we plugged the hose and tried to run the engine without a pcv line. We went down the road and the motor started smoking like crazy. Would an improper pcv valve cause this smoking and just on the drivers side exhaust. I'm sorry to be so ignorant about these FE engines but I do want to learn. This car runs like a rocket otherwise and I'm going to offer it up for sale soon. I want everything right and can't have it smoking like this. Any help would be so much appreciated. I am not giving up until I learn how to figure this problem out and solve it. Many thanks in advance for your advise.