Seeing all the stuff you have replaced and tried, I'm thinking an inlet needle and seat leaking slightly allowing the fuel level in the bowl to creep up, at idle, and finally start to cause overly rich mixture. Driving will erase the problem as the floats are then calling for more fuel and the small leak is insignificant. Had this very condition on a /6 decades ago.
Find someone with a ignition scope and tailpipe sniffer. Then you can rule out ignition OR a fuel going rich/lean condition. Just my 2c.
