A good second hand factory Ford crossflow water pumps may actually be better - having a cast iron impeller,
vs pressed tin impeller on most or all, of the after market pumps.
it will get close to the el fan shroud if you mount it on a standard flow rad. The thread that holds the fan gets close to the el shroud.
I cut a notch out on my fan shroud to make fit, if was doing again would put the water pump in the lathe or mill and cut the end off.
I'm actually going back to a big single for street and mainly to remove weight and make it eaiser to do pipe drop on race day.
Went for a 3.5" Hooker Aero Chamber and I'll add a Gonzo style race muffler and flange for a turn down so if @ PCM or events that require mufflers I'll still be legit but I can remove the the rear of the exhaust for weight saving and no real loss of power.