Steve, have you considered drilling, or having drilled a Chevy bolt pattern into the existing axle flanges? Dan wanted to run 40 Ford wheels on his 9 inch Ford rear and we sent the axles and drums to Currie and they redrilled them to the 5.5 pattern. It looks like you have enough meat on those flanges to get a 4.75 bolt pattern in there. You would put the new holes between the existing 4.5 pattern.

Just a thought.

Don