I was able to find 1 or 2 on 3TCGARAGE.COM for sale. One seems to be mildly modified and was asking quiet a bit. ($2500) http://www.3tcgarage.com/viewtopic.php? ... gte#p56466
While the other one was basically a head and a block and a few things ($1250) http://www.3tcgarage.com/viewtopic.php? ... gte#p49434
this one I found came with a car and had two prices ($800) just for drivetrain ($1200) for whole car. http://www.3tcgarage.com/viewtopic.php? ... gte#p53467
what I did find out is the bellhousing is highly sought after for it can connect a T series motor to a W series trans. Ive seen a couple go for $200 and one on ebay thats at $400 atm.
other than that I have found next to nothing on pricing. On one hand the motor seems rare but on the other hand its so rare that maintenance seems to be a money pit.