another exhaust question...(not a normal one though)

[tracterman2]

okay, restoring back to (close anyways) to original. I want to go with a single exhaust...I HATE the way the left bank just t's right into the right. I want it to come together a bit smoother...maybe a Y pipe or something. I LOVE how quiet the truck is...I've never had a quiet truck...always duals, flowmasters or glasspacks....or my cummins....straight. This truck is a 70 with a 307 and is SUPER smooth running and quiet with the ??$#%#%$#??? old exhaust on it...hadn't been started in 15 years before I got it...has 44,000 documented miles on it. I'm keeping the stock 307 and no mods...expect HEI for depenablilty. Want the most flow...through a single pipe...and be DEAD quiet. I was thinking 2 1/2" pipe all the way back...that should be WAY better than the one 2" pipe on there now...and the old rusty muffler. I just don't think a single 3" would look to nice sitting under the frame...don't want to cut my crossmember. Any single exhaust pics would be nice...tell me what you guys think, and any suggestions on it. Any high flow DEAD quiet muffler ideas would be nice too. Thanks