i have just purchased a 1967 toyota crown toyoglide with the 2m ohc 6 cylinder motor it is an imaculate original white with blue interior one owner and has been unregistered since 1994 first job is to re-do the brakes and i am wondering whether to keep it original or upgrade to disck brakes and a duel circuit. any advice on intechangeability with later model parts or opinions or spares is welcome