S14-d carb adjustment

hello, i recently converted my carb from an old style walbro to the WGH-31. their are actually 2 screws it seems for adjustment- one is hear the top upper left side pretty close to the manifold- the other one is left side- lower near the bowl- my 1455 seems to be starving for fuel, starting really hard- is one of these to adjust for a richer fuel mixture? took off air cleaner and when i turn it over it wants to spit out the carb- not really backfiring ,when it starts- it runs good- fuel pump is working well also- and good spark