This has nothing to do with the purported LS9-powered TVR MD-1 we were told we'd see next year. This is being presented as a way to get TVR doing something while the world waits on the MD-1, and appears to involve both creating new cars as well as refitting customer cars.
If you're interested, a complete LS3 or diesel retrofit will relieve you of £33,000 ($53,112 U.S.), which includes the engine, Tremec manual gearbox, brakes and a modern dashboard. The engine and gearbox alone will tally £16,400 ($23,392 U.S.)... which means there must be an awesome dash-and-brake combination. No price has been given for the electric version.