I would leave it race ready myself...
But, you'll never get what you put into it normally with an A body.
Also, putting parts back to make it more original would be even more cost that you won't recoup!
I think that race setup is sweet btw...
As far as an all original 340 car totally restored, I've seen them go for 30 on Ebay (occasionally) 20 around town... But, that is completely restored and gorgeous inside n out...
It probably wouldn't be worth all the swapping and restoring, considering what you already have into that race car (by the looks of it)... IMHO