I'm looking to add 2 MPH to my current top speed of 42 MPH. I'd love to get to 44-45 MPH but i don't know if it's possible... Acme is telling me I may gain 1/2 MPH with a Reverse output 1442 larger prop but not sure that is worth the additional investment. Any other suggestions? I appreciate any direction or insight that you could provide - Thank you

1989 Supra Comp
Ford 351 – Windsor Engine
Reverse output (I think)
Transmission is the 1.23:1
4200 RPM’s fully open with current Acme propeller set up
42MPH Top Speed with Current Acme propeller set up
Current Prop: Acme 598 13 x 14V R1 37M