Maybe I'm just assuming. Are you going to pull with it or just a hopped up yard tractor? Some folks, like me, just want a street rod that cuts grass. If that is the case, some things like boring the carb would not be a good thing. Same with the3 billet flywheel. You wouldn't have any cooling.
Well there is a way to cool it. All the pullers have a small electric fan they run over top of the head to keep them cool. They use high cfm fans. But I do understand where your coming from as far as cooling.