Actually, I find it hard to believe that you installed it backwards and could still get the drive coupler hooked up ? Is this the origianl flywheel ? If not, is it possibly one for a transmission mounted starter, they have the starter gear in the wrong position for a block mounted starter ? How about a pic ?
If indeed you do have it on wrong, you should be able to pull the drive off and then the bellhousing off to swap it.
Advanced Automotive Machine