Mild Built 340 Timing/tuning help?

Agree with above, the 110 is costing you money and likely power. Run pump gas. A good general baseline to start at is 32 total with one light spring and one medium spring in the distributor. That should get your all in around 3000 and and not be to fast that it pings. Tune from there. You have to limit the mechanical curve to run higher initial numbers, which your engine will probably need to get the transfer slots synced up.