2 BBL carb and manifold

A 2bbl on a stock 68 slant will work good but the 78 225 has the best cam for the 2 bbl set up. The only thing you really need to do is larger exhaust piping. That one modification helped my slant more than any other thing I did to it. 2 inch id is good with a nice free flowing muffler . You'll really see the difference when you go to pass someone on the hiway. It woke my little 170 right up.