There was a Proffitt's built 1978 FJ40 with an LS1/4L60/Orion T-case that was beautiful just the other day on BAT. The 6 page invoice from Proffitt's (from several years ago) wasn't far from $50K and there was a receipt for a truly nice custom interior for $16.6K. I was surprised it hit reserve, because the selling price was only $63K.
To me, this was an exceptionally well done and capable FJ40, and it sold for tens of thousands less than you could build one for today. Here's a link:
Bid for the chance to own a LS1-Powered 1978 Toyota Land Cruiser FJ40 at auction with Bring a Trailer, the home of the best vintage and classic cars online. Lot #213,054.
bringatrailer.com