Here is a running 72/73 2.4 T engine posted in the classified for $6000 w/MFI on Feb 5.
Sold in one day.
http://forums.pelicanparts.com/porsche-911-used-parts-sale-wanted/795211-1972-3-2-4l-911t-mfi-engine.html
There may be a bunch of T motors for sale somewhere, but I only found that one comparable, complete 2.4 MFI motor on the classifieds in the past 18 months.
There was a largely complete 2.4 with CIS that apparently sold for 3K, but with the exhaust, engine tin, and some other parts removed.
http://forums.pelicanparts.com/porsche-911-used-parts-sale-wanted/749379-fs-1973-911t-2-4-cis-engine.html
techweenie was interested at the time -- maybe he has more info on the deal.
Sounds like $6-8k is not unreasonable. Maybe more depending on condition.