54 belair power brake booster

Hello all.I ahve anotehr question for my 54 chevy project.Now my master cylinder is leaking and instead of repairing,I want to replace with a power brake booster in the original frame location..has anyone done this replacement and if so what problems did you have? wheres the best place to buy and wa sit a boltin replacement or is there alot of modications?hopefully I can get this resolved and start up the car and go for its maiden voyage with pictures to follow.thank you in advance.
Ty

 

I have seen replacement power units advertised as a direct bolt on the original "K" member. Their on ebay. Also I think Chassis Engineering or TCI has them. Check their web sites.