Bad knocking under feet

To me it looks like where it drops down by the starter it needs up and inboard, the problem is where it goes under the frame.
I was able to get in the pit at the exhaust shop and see it move, that was how we determined it was worn engine mounts.
Not saying yours is worn engine mounts but if you could see it move you might better see the solution.
Somewhere in the engine swap (along with who knows what swap) something moved or was modified.
To test we put the car in gear on the rack and goosed it while holding the brake.

You could look at the pipe to see which spot is hitting, I bet they both are.


Alan