No, still in the back. Robert kinda worded it funny, front brakes are applied by the pedal, the line-lock blocks fluid flow to the rear.
Your idea sound interesting, I used to have it on the front, but I removed it after the new calipers, master Cyl. (use the 1974 Fury M/C, its big like the ones on the (1970) 440 E-bodys). It has no residual valves in it, so you can chose the wheel Cyl. with metal cup backers for better hold. I did not like having to plug one front outlet on the Porp.Meter Valve. and teeing the fronts after the line lock. It seems like less fluid would go to the front and unbalance the brake bias, front to back.
Now the question is, why don't you use the momentary type switch that comes with the Hurst Roll control Kit? And do you find any difference in the pedal resistance as you set the brakes with the lock on?