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On a 22 Whaler Drive, twin engines should be up in the fifth holes, if the engine brackets have them.

If not, use the fourth holes, but you may not get optimum performance, and may get some gearcase spray. I have seen that problem with older Johnson 150 2-strokes.

The Mercury prop selector will not work for Suzuki, since the Mercs use higher (numerically lower) gear ratios. You should, however, be able to use the Merc selector using the 115PRO XS engine, actually about the same HP at the prop as the Suzuki 140's. The prop they recommend should give top speed indications. I would guess your boat will run about 45 MPH. Those 140's are pushing the weight limit on the hull, since they weigh more than the 2-stroke 150's (about 380# each) the hull was designed for.