New to the group but not bikes.....

Hello from the Sacramento foothills area , 1st post. Picked up an 83' V45 with 7K miles at the Auburn Swap last summer. Finished both front and rear suspension upgrades courtesy of Jamie's website. Rebuilt the total fuel system and sanitized a lot of questionable work from the previous owners. Added Pirelli rubber and the infamous oiler engine kit.

The bike works well and is deceptively fast when coupled with the suspension upgrades but I am running out of brakes and need a more powerful caliper action on the front. Does anyone make a four piston caliper than can be switch out on this 83 model. Modifying work not an issue if required. I want it to brake perform closer to my RC51 if possible. Any hints?