This is the 377 with the T76. Looking at a 6500rpm shift point. The turbo will full spool less than 3000rpms.
Total engine, tranny with tune should run around £4500, and put the car in the 10's.
Can you imagine getting 800hp, and not really have to go spend £500 for a dyno tune. Also be able to get a tranny for £1000 that can handle 1000hp day after day. Its pretty much a no brainer for me.