1987 van catalic exhaust fumes in cab

[Neal7]

I have a 1987 delux van LE. There is a constant smell of catalytic converter fumes coming into the cab. It worsens when excelerating and even more so when I open the window sightly. I have replaced the engine compartment seal which helped some. The catalytic converter and muffler were replaced, no improvement. The back door seal is in good shape. I replaced the striker plate for the back door latch but there is still a 1/16" play in the door.Toyota found leakage at the flange and replaced the gasket and missing studs and nuts. Improvement but fumes still entering. I would appreciate any advice.
Thanks, Neal