fctm 5.23 :" Fail operational airplane is certified for Category 3B operations with two engines operating for flaps 30 or 40 landing,or,when certified,with one engine operating for flaps 30 landing"
I know this concerns the NG,but ,it's almost the same as classic regarding flaps 30 or 40 influence on deck angle.
Also ,the ils app/ldg geometry diagrams from Boeing are made considering flaps30 .vref30+5
i.e. 737-300 GP 2.5 airplane body attitude 3.7
GP 3.0 BODY ATT 3.2