I need to find a 2 blade steel prop for my V drive drag boat. Currently running a 11 1/2 X 15 pitch prop. Would like to get a little more bite with a 16 or greater pitch prop. left had rotation and a 1" shaft. Has a strong BBC 454 and I don't want to spin it as high. Boat is a late 60's or early 70's Rayson-Craft 18'. Had mahogany deck but was painted over by previous owner. Has a stringer tag with "GN78: on top of port side stringer. could any one tell me what year this boat is. I just picked it up a couple of months ago. I hope to post pictures soom.