82 Bayliner 2350. Original setup was Volvo Penta 5.0 with Volvo Penta 280 single prop outdrive. Engine was toast so I rebuilt and marinized a 98 GM 5.7 vortec TBI truck motor. I was given a good set of duo props that are the proper ones for the 280 outdrive but now find the conversion requires more than just getting a dual prop shaft. Is there a kit or am I looking for used parts? In either case, is there a list somewhere of what I need to replace to make the conversion?