Going EFI. Can't decide

To narrow it down, I will be using parts Ive already purchased. MSD dist. Locked out. An MSD 6a ( I have a 6al 2 programmable NIB but since efi controls timing it isnt going to be used for full potential so ill likely sell it)

Would it be much difference in drivebility if I chose tbi instead for ease of headaches.

TBI will basically be an electronic carb. It can work, but you won't realize as many of the benefits (ability to optimize each cylinder, for example). On the street, the only implication would be reduced MPG versus port injection (assuming both systems get extensive tuning/mapping tweaks to get best low and part throttle operation). In reality the differences will be minor and it should still work at least as well as a moderate flow carb.