1) I am using the Ron's crank mandrel, entire install kit.
2) I am not sure what brand the crank pulley for the alternator is, I bought it at a swap meet 9 years ago. But it looks like a Moroso.
3) I haven't been to the track yet. Weather is not cooperating. But I have run it in the garage. And yes, the alky fumes will kill you. I have exhaust turnouts to help at the track, but in the garage...
All my pulley spacing is adjusted. Including my alternator since it is a Delco 10-SI fit into the stock location.

I can't help with the fuel cell mounting. That is a tough one on a stock front end A-body. Hopefully others can give some tips.