Honda-SOHC

Hi guys im a new en, currently in York, but live in Portugal and thats where i will be taking my 400/4 to when i go back in the back of my van. I bought the bike off a mate of my father in law who has owned it since 82, its a 1975, and has only clocked 6000 miles in 30 years on it, i always admired it and when he offered me first refusal i had to say yes (i will put a pic on when i get a camera linked up) a couple of questions. Is there a front brake upgrade kit for theses bikes ? ive heard you can get a kit to stop the timing chain rattle, and it came with engine bars and rear bars, which i dont like and have removed, any idea what i should put them on ebay for ?