I run 11:1 on pump gas, so 10:1 is not that big of a deal. Then again I tune cars for a living. Can you get and keep yours in tune?
38/38 will have synchronous throttle plates, not progressive linkage opening 1 barrel at a time. Its basically a vertical DCOE, almost. Its a solid "middle ground" carb choice between a SUs and 2 DCOEs. I rate a DGV almost as low as the stock carb.