Vacuum leak where EGR is

I was checking the long term fuel trim and short term fuel trims.

The short term is at 0.
The Long term is at like 6-7%.

I did a smoke test on the truck. It seemed that between the EGR and Were it mounts on was leaking some smoke I am guessing bad gasket or incorrect torquing.

I checked the manual said 18 ft lbs of torque on the mounting bolts. So I did one side and the other side. Did not want to torque up it just kept spinning and not getting any tighter.

any advice on how I can get that screw to torque right, or should I look for another screw at a junk yard? Lol. On that EGR gasket should I get a new one or use some gasket sealer?