The V-brakes will not adjust from a 406 wheel to a 451 wheel. You will have to go to caliper brakes which will usually mount to the fender hole that is centered above the wheel.
The Road levers when hooked to V-brakes have extreme stopping power. road levers have 2:1 leverage vs v-brake levers which have 1:1 leverage.
Since the cables only move half as far, your wheels need to be really straight or the brakes will not come far enough off the rims. The mini-v brakes for bmx race bikes have a bit less leverage.
I am sure a good grip on the brake levers will send you off the front. Be careful.
Really nice looking setup. Enjoy..