My '51 235 has 105 hp stock, and a 6.6 to 1 copression ratio. I want about 150 hp but, around 200 would be better. I know the '53 Vette 235 had 3 carbs and dual exzaust I think, and that was rated for 150 hp but, that was the newer, preassure oiled 235. I was thinking about an offenhauser 3 carb intake and fenton headders but, the most I think I can coax out of it with that is about 130 hp. I was thinking possibly adding a 4-71 Blower with the fenton headders but, I'm not shure about hood clearence or even where to get a 4-71 that will bolt to the old 6 cyl. Does anybody know where to get them and how much they cost.