Oversized exhaust valves

well you've been exploring your options for 3 days.

Here's the summary.

Try to lap it in and if that doesn't fix it...
Replace the seat

Or

Buy the expensive 1.65" and hope like hell you don't have to replace the seat anyhow.

Or

spend a week trying to ****-hack it with whatever mismatched leftover parts you might have and hope like hell you don't have to replace the seat anyhow.