23' CC Power - new member - first post

[ScatCrafteer]

First post here also - A friend of mine found me a very great condition 1981 23' Seacraft close to home. Not doing a full restore yet due to funds but I am changing fuel tank, floor panels, patching some spots and repainting, etc, it had twin 150hp that did not come with the boat and I am looking to repower. Not planning on a bracket yet either. I measured from bottom of V to stock transom cap and it is about 28 1/2 to 29 inches. But the boat will not be sitting in the water at that angle right? I have the option to buy 2 99' yam 250s in great condition at a bargain price from a re-power but they only have a 25 inch shafts. Will I need a 30" shaft for a big single as opposed to twin 25 inch shafts? Or can I get away with a 25 inch single shaft length and try to find a prop that will work. Thought I would ask the experts since Seacraft Corp. and my local marine dealer are unsure?