[mr48chev]

It's always best to start a new thread when you have a question rather than dig up a long dead (3 years) thread simply because people will respond to the first post without scrolling down the page to read other posts before they toss out their answer and your question will be missed completely 90% of the time.

That said, as far as wheels go it depends far more on what you want and what you intend to do with the truck than anything else.

First thing on the agenda is why the mix and match axle combo? Have you asked why they have six on the front and 8 on the back? Years ago as in the 60's guys with old trucks would stick a 3/4 ton =8 lug axle under a 1/2 ton truck so they could haul heavier loads. Meaning that the truck most likely has a granny 4 speed in it along with the 8 lug axle. On the other hand if it was a 3/4 ton from the start and they damaged the front axle in some way shape or form and they had a 1/2 ton axle readily available cheap they may have done the swap rather than hunt down and buy another 8 lug axle.

You can buy 15 or 16 inch 6 and 8 lug wheels easily enough if you want to run a combo of the two and not swap axles. If you want a near stock looking wheel. That may all depend on your long term plans for the truck which you need to start a new thread on if you buy it.