Switch to Full Synthetic Oil

I have run Mobil1 15W50 in my 340 since after the first oil change at 3000 mi. I also use the Hughes oil additive since I run a flat tappet cam. When I put the Edelbrock heads on, I couldn't believe how clean the engine was. I'm sold on synthetic. When I used conventional oil the inside of my engine wasn't as clean.

Fred B