you can adjust whatever you want. if you don't adjust the VE table or other airflow parameters what's going to happen is the ECM will just trim the fuel to be correct. edit: when i say correct, i mean roughly correct.

adjusting VE is not a scary thing

all it is, is a grid of numbers. higher number more fuel. lower number less fuel.

one axis of the grid is load. one is engine speed.

so if you increase the number by 5% at a certain load and speed in this table, you get 5% more fuel there.

it's not only more precise than tuning a carb, it's way way easier.

also the old TBI ecms are great for caveman tuning. the VE tables are tiny and imprecise, but they work.

if you have a wideband and you learn to log it, adjusting your VE table so all your fueling is correct will be a very very simple and quick task