I think there are just two choices with a Stovebolt engine: run them exactly as produced or replace them. With one of the worlds worst (for performance) head, intake, and bottom end designs trying to hot rod them is like topping a cow pie with whip cream---might look appealing but if you dip into one they are still excrement. Ford and Chrysler made I6 12 port heads and Ford made bottom ends with 7 main bearings nearly 60 years ago. Models of some Aussie 250ci Fords came from the factory with 12 port cross flow heads and yes, they run strong. Never could fathom why ones wanting to hot rod an I6 didn't just use a 240 or 300 Ford in their Stovebolt truck. If one feels they MUST have an all Chevy ride then the 2002-2009 Trailblazer has the Atlas I6 which has a crossflow head and makes more than 1hp per cubic inch stock; 275hp out of 257ci. With some rodding one can be over 500hp. Been waiting for someone (hint, hint HRL) to make a "dumb" Atlas with carb and distributor so pliers and screwdriver bolt owners would feel comfortable with them. Believe there is a market for such and engines are cheap and plentiful in the salvage yards now.
