I put the old gasket back on lol. Oil looks fine on the dipstick... I swear I hate to pull all that stuff back apart lol. Might as well just but a chain fall and hook it to a tree and pull the engine and replace everything lol.

 

Sounds like piston rings, my 88' Mustang GT smoked at idle and under hard acceleration. Indication of worn valve seals would be if your car sat for about 2min and then gave it throttle and blew out a cloud of smoke. My 96' Mustang GT did that.

 

It would be normal for the engine to lose some compression over the years. The best way I know to tell the difference is to have someone follow the truck. If it smokes a lot when you let off the throttle, that's usually valve stem seals. If it smokes all the time, that's probably rings.

 

When you torque the gaskets they compress. Even though they may look good you need to replace them with new. As previously mentioned, white smoke is usually an indication of water getting into the cylinders. I would start with replacing the intake gaskets with new ones (properly torqued) and go from there. Use fresh oil when you do a wet compression test. I wouldn't think a rebuilt engine would have excessive blowby, but anything is possible. Excessive bore taper, improper cylinder honing or ring end gaps that weren't properly spaced could all contribute to blowby.

I was going to suggest a leak down test, but didn't know if he had the compressor, plug hole adapter, etc to perform the test.

 

Woah, you reused the gaskets? Terrible idea..... didn't catch that initially....