225 /6 at 250HP?

hey you asked about putting a auto od behind your /6 , well in the 60's dodge put /6's and loadflte auto's together . using an adapter and crank spacer , loadflite has the la smb v8 bellhousing pattern and this adapter bolts to the /6 and lets you bolt a la smb v8 auto trans to it . so the newer o/d trans thats behind an la 318 , 360 , 5.2 , 5.9 will bolt right on that adapter . just must add @ inch to you trans mounting from the stock location . and your starter just bolts to the trans in a v8 placement .

You are correct, but just try to find that adapter. Few and far between. Then you need to cut the floors, and heavily modify the trans cross member (don't forget that is also the torsion bar anchor). Plus the converter, and OD unit in the A500 trans is not very good, compared to many other OD automatics.