So you're suggesting drag radials that are about 3" wide, and slicks that are 10" wide
235s would fit on a damn civic. At the very least run a 255, which will easily clear. You would be better off with a 275/50. But to run that you will have to flip your quad shocks and massage the inner fender a little. But it's really no big deal and you will not have to touch the outer fender or lip.
10" slicks would really be pushing it.
God, where do I start. Please don't respond when you have no clue what you're talking about.
First, stock axles are 28 spline and actually reasonably strong. They're kind of hit or miss though. I have seen many last behind 500+ rwhp and sticky tires. At the same time, I broke one behind a stock motor. It was a 6250 launch at the track, but it still shouldn't have broken.
If you're going to upgrade axles 5.0 resto would not be the place to go. Get them from a reputable company such as Moser, Strange, etc.
There is no "mistake" when running a 28" tire. People run a 28" tire for a reason. More contact area, more sidewall, more flex, more traction. Especially when using a slick on a 5spd car. I run a 28x9" slick with absolutely no clearance issues. My buddy runs a 275/60 (28") on 15x10s with no clearance issues.
Finally, a 275 is not too wide for a turbine wheel. Another friend of mine has been through several sets of 275s on turbines without an issue. I run 275s on 10 holes which are the same width and never had a problem. They stay at 14psi all the time, cruise at 75 on the highway, go around corners, and I drive the wheels off this car. Oh, and it's the only way to make turbines or 10 holes look good...