Port EFI also allows you to use (dry) manifold shapes and plenum volumes that would cause fuel droplet fall-out with a carburetor.
A TB system will have the same mixture distribution problems as the same manifold with a carburetor (almost any dual plane will have this). Is your current or planned manifold known to flow all 8 very close? A port system will improve this if it allows individual cylinder adjustments.
Let me dispel a few misnomers about efi...Even port injection benefits from good balanced air flow. It means less tuning to get things right and plugs look better. Improper porting or bad or uneven air flow can be made to work with efi, but efi does not fix it.
TBI's work really well too. Get the squirter shot right and target AFR, and mine repeated back to back within .03s of a well tuned carb.
What does inprove, drivability, cleaner plugs, cold starts, data logging......It also lesson some of the finicky tuning for perfect AFR..EFI will maintain this level of tune all the time.
