stock mani is restrictive for any carb or efi setup
and for 1000 clams better go DT carbed turbo

EFI even on todays most advanced Ford 4.6 engines
with factory tuned efi struggle vs Carbed setups
http://www.musclecardiy.com/cylinder- ... et-cylinder-heads-part-5/

All depends what you want but carbs are still not that bad
for economy and overall decent performance if you just make sure
your engine is healthy, higher comp and slightly larger capacity
if its getting either a freshen up or full rebuild

The single injector setup shown above had flat spots