1- a New Crane Tank and NBowl toilet cost around $60
2- A new toilet will NOT match the existing tank as far as color is concerned (One is aged huh?)
3- The newer Crane toilets are 1.6 GPF and work fantastic
4- Dont you think that after spending 45 YEARS on the job this toilet deserves to retire?
5-Your spending money on a new alteration WHY use something old and screw up the looks of a new bathroom?