They redline at 6800 (stock), and float the valves just above 7200 RPM so unless you've gone to solid lifters you won't really see 7500 RPM.
The MP45 is a good choice, it is a very efficient blower (for roots anyway) it's got the new 120° twist rotors. It's a good match for the 1.6
The SC14 is a little large for the 1.6 but will work, it's got a electric clutch on it which is nice, and the packaging is relatively convenient so adapters and brackets would be easier to fab. It's a regular roots style though and are nowhere near as efficient as the Eaton style, especially the MP series.
You should find turbo ECU, harness, distributor, vaf, etc - all the sensors + injectors - those will supply you with enough fuel to run around 10psi on either blower. It will fuel the engine just like if it had a turbo on it