GM A body narrowed rear

I am building a 64 Olds F-85 wagon, I have done a SSBC disc brake conversion with a 2" dropped spindle and a poly front end rebuild, and a IDIDIT column,I am thinking about a tubbed rear the car will not see any strip time but I just want the look and don't want to spend big bucks any Ideas? Any input of what the biggest meat and wheel size I can hang under this with a stock rearend, I have 65 442 rear control arms and sway bar, I can do most of the fab work myself with the exception of narrowing, can you Chevelle guys give me any real life experience?

i did a 64 malibu , it had a 10 bolt rear . we built a cheap driver, we didnot narrow the rear axle just mini tubed the body, and got 20 x9.5 w a 295 40 bfg under it no problem , we kept all the rear axle mounting points stock ,just the inner 1/4 wheelhouse.
hope that helps

kenny, knowing the offset on those wheels might be useful info too.

if i remember correct it was 5.5 back spacing on a 9.5 wheel