I carry a wide range of fuel injectors to cover a spread of engine combos.
(4) 24# stock to 150 crank HP
(4) 32# upto 200 crank HP
(4) 40# upto 250 crank HP
(4) 48# upto 300 crank HP
(4) 65# upto 350 crank HP
(4) ID1000 upto 600 crank HP N/A at standard fuel pressure
ID1000 upto 450 crank HP Turbo at standard fuel pressure
For turbo applications the rule of thumb is to pick the next larger size for the same HP as you will usually be running a lower AFR.
There numbers are for Gasoline.