I'll take a stab at it .
Must use jack plate with a 20" shaft motor, cavatation plate should be even with top of tunnel for best performance . 4 blade will give best hole shot but 3 will be faster. Pitch, don't know much about 4 strokes but I would get plenty of cup in any tunnel setup. More cup less slip. Trim tabs can be welded at the bottom of the transom and adjusted using wasa cresent wrench. Make sure you balance your weight, keeping gas,battery up front to hold the front down. Weight distribution is key in the performance of any tunnel boat. Post a pic and more info and someone on here will be glad to walk you through the finer points. Can you tell us what type of terrain you will be running the tunnel in? Never though tunnel boats would be necessary in Ar. Will try to post a pic of my setup tomorrow.
Raymond
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