Mate, you are buying yourself a lot of heartache for an extra spring!!!!
He is just trying to flog you off his old stock.
Plus it won't ride well empty, you'll be bouncing around all over the place with the harder riding suspension.
You'll need to have a pallet of cement in the back all the time or get yourself a neck brace LOL.
Maybe talk to Pedders and get the suspension upgraded if that's a concern.
At the end of the day you need to decide what suits your needs.
That's what Performax told me as well. Interesting to see what their price will be.
Nothing wrong with a car that's had beach work is there?