Has anyone heard of using the later syle reed plates on a 58-59 V4 50 hp. The manual I have said for increase fuel mileage on 58-59 50 hp use a 75 hp reed box. The manual said to grind down the corners of the reed boxes to make them fit. I got a set off of a mid 60's 60 hp and all I had to do was grind the bottom corners of the two inboard reed plates. I haven't tried to run it yet. I don't know who makes this manual, it is one you get on EBAY on a CD.