Substitute for 33uF axial

Remember it's fine to go for a higher voltage rating if they're available. 16v is the minimum you should fit but there's no problem in going higher.

Yes it's fine in most cases to use a more modern radial cap. As always, just bend the leads slightly away from the end seal so as to not damage the seal. I use some fine needle nose pliers held tight next to the seal to hold the leads firm and make the bend below the jaws of the pliers.
Yes that's right.

If you bend the leads right at the point where the leads enter the body it can in some cases damage the seal leading to the capacitor failing more quickly because the wet electrolyte escapes more quickly from the damaged seal.

It's a minor point but it's always good practice to 'dress' the leads properly.