Retard timing advance 2 degrees per 50 hp of increase.
With the mph your running looks to be high 12's, course if you dont spin off line you may pick up another 1-2mph.
I'll guess you run 12.75-80.
I personally run with 1/4 or 1/2 tank gas, remove spare tire(well I remove lots of stuff
) With my Drag T/A's I set them at 18psi, 16psi if track is hot. You would be best to play around and find best setting for tire pressure