It shouldn’t be ‘smelling rich’ with a catalytic converter, that’s its job.
The ECU is factory set and cannot be adjusted.
If it has a piggyback ecu I think it is at fault, take it off and send it to me, I’ll send you my spare ecu.. oh oops it’s a mania one.
if you’ve carby cleaned the Throttle body , maf and intake then I’m at a loss over the interweb.
Get the car up to good operating temp and try to get an exhaust pipe temp before and after the cat converter, take it for a 15 min blast and check the temps again. Output should be higher than input, if it’s the same before and after then either you waited too long or the cat has been removed. Hotter before cat is a blocked cat,( symptoms would be opposite though, choking up high idle ok).
old car guy says bogging low or hesitant low.. new points and condenser required.
do you have access to another crank sensor? Might be worth a try but best pay someone hundreds to run it on a dyno for you.