340 smoking out left exhaust only

I broke my 904 while on the Power Tour got it fixed. On the way to my house from where I installed the repaired transmission, I got into it a little hard and it been smoking out the left side ever since. It’s a 340 stock bottom end with x heads and a roller cam. I’m going to get back over to my shop to get it apart. This build is two years old it runs great even though it smokes. It’s definitely oil, I have changed the intake gaskets. I’m wondering what you all think? What could possibly cause this, it does have Holley Terminator fuel injection, my dad thinks it could’ve went lean and burnt a piston it is cylinder 7 causing the issue. I’m wondering if I didn’t break a ring or I had ring line up. It does have a 175 psi compression on that cylinder. When I get home Sunday I’m going to do a leak down on that cylinder my question is what does everyone think could be the issue?