ok......
The intake is from a Ford Explorer and is similar to a Cobra or GT40. Your throttle body looks stock, and some type of ghetto rigged EGR. Your injectors look like lucas aftermarkets- maybe 24lbers? You also have an aftermarket Mass Air Meter. which I assume is matched to the injectors- cant tell as the writing is off. You have an aftermarket fuel pressure regulator and fuel pressure gauge... You can verify what size injectors you have by opening up the FMU carefully and seeing what size the disc is.
19#/Hr.- 12:1- 2.7215"
24#/Hr.- 8:1 -2.2220"
30#/Hr.- 6:1 -1.8525"
38-42#/Hr.- 4:1- 1.5910"
Here is a complete injector chart for Ford made injectors
Ford Bosch Stock Injector Colors & Sizes
12's - Gold top
14's - Blue Top - E3EE-BA ( Low Impedance )
14's - Gray top -
16's - Blue - E43E-AC ( Low Impedance )
17's - Creme/white top ( Low Impedance )
19's - White - E6EE-AB ( Low Impedance )
19's - Orange/Yellow top -
19's - Gold
19's - Yellow/Black
21's - Lavender - ( EV6 )
22's - Pink top ( EV6 )
23's - Black - E4EX-BA ( Low Impedance )
24's - Light bluish/gray top -
25's - Blue/Green -
25's - Light blue ( EV6 )
30's - Dark Red top -
30's - Green - E3ZE-BA ( Low Impedance )
35's - Brown top ( Low Impedance ) -
36's - Cobalt blue top ( sometimes silver )
37's - Green- E3VE-A1A ( Low Impedance )
39's - Blue ( EV6 ) ( thin style ) -
42's - Lime Green top -
46's - Blue - EOSE-A1A ( Low Impedance )
52's - Gray - E43E-AC ( Low Impedance )
56's - Blue - E43E-AC ( Low Impedance )
64's - Green - E53E-AB ( Low Impedance )
150's - Bright Orange top ( Low Impedance )
WIthout knowing if you have a chip or a tune, the stock fuel pressure should be 39 with the vacuum line removed and plugged.