matpat

hi, I`m from quebec(canada) and i talk french so sorry for my english. I just buy a mustang lx 1990. The mustang have gt-40 head and the cam have been change (unknow). There is an intake manifold(trick flow) and the tb is a 65 mm. The gear is 3.55. i have a 2 1/2 h-pipe exhaust with headers every thing else is stock. The ex owner give me 24 pounds injector and an 75mm tb with a maf of 75 mm and a egr spacer. I wont to know if i can put the 75 mm tb and the injector if i will to change anything else(fuel pump,computer).

The fuel rail have already been change.
I`m wondering how many horse power do i have right now and how much the injector and the tb will give me.
thanks