Aluminum Drive Shafts.... thought?

Diesel Trucks that make 800+ ft/lbs of torque bone stock run aluminum drive shafts for 100's of thousands of miles. So there is no issue with running one in a daily driver.

The issue with an aluminum shaft in an A-body is that you are very limited in space between the driveshaft and the exhaust. Aluminum shafts are larger in diameter, which may cause a fitment interference. Using a smaller diameter aluminum shaft may cause t to not be strong enough.