fuel injector size

I bought these 5.0 injectors and was planning on putting them in my 2.3l today but im hesitant and need a push in either direction. I see some saying this will make the car run a little better, some say it'll slow it down and others that it'll fry my ecu. I've not got much done to the car except...

Iv got a older PMAS 85mm mass air meter with adapter and air filter. Whats the going rate for something like this?

Have to replace fuel injectors in the sister in laws mustang. 2009 with the 4.6L V8. Was wondering what size the stock ones are. Thank you for the help.

New to me Car. Somewhat of a Frankenstein engine. Donor car was a 1993 Fox Body GT. The engine was rebuilt and upgraded with: Edelbrock victor Cobra intake Fly cut pistons Compcams 1.7 roller rockers Compcams 1pc hardened pushrods 130 amp alternator King cobra clutch X-303 cam (286 degrees...