If the house is so old that you have a wall mount tank, I'm guessing you have a 4" drain.
You can pull the bolts over and make it work.
Sometimes if the flange is notched, I put down a repair flange that lets me move the bolts.
The Drake works at 10-7/8"
If you pull the bolts forward, you can get 10-3/4"
In the Seattle area, I'm bringing in some 10" Toto Drake toilets.
They only need 9-1/4" to install.
CST744EF.10 or CST744SF.10
Comfort height, elongated bowl with either the 1.28 gallon Watersense Eco Flush
or the 1.6 gallon G-Max flush.