'63 Dart (maybe Valiant) firewall mod.

Or just hotrod the /6!

BC
By that you mean hot rod the /6 wiper motor? Right! LOL! Once you get under your dash you'll see there is quite a bit of space up there. For the small amount of material that needs to be removed for dizzy clearance, I think you could remount it and it won't be off much from where it was. This shouldn't keep you from V8 conversion plans as this is only a small hurdle in the in the big picture. Motor mounts from Schumacher make the swap easy. Exhaust is a different story. You will need a V8 dropped center link as well...and the list goes on. Check out this list from member brummett:
http://yetanotherdomain.org/abody/v8swap.html Great info here!
Good luck with your decision.
Larry