Alloy piston in an cast iron block never let the rings seat properly. I chased it around for over a year. Too much
oil in the heads, pcv valves, plug wires, plugs heat range, etc, etc. I knew I was in trouble as soon as I pulled the heads. Be fully aware not everyone knows how to machine and build a FE. I went to one of the best Miller Machine Haverhill MA. Car runs great NOW!!!
Cost $8,000.00, having the car back to drive priceless.