I had a Chimeara with the Tuscan headlight conversion same as this one. It was not tubocharged, but had been tweaked to 320BHP (from standard 260 BHP), it had uprated suspension and brakes. I don't rate GAZ and would have gone for some thing different. So this car is nearly twice the power TVR thought it was safe with.
I think when you are considering this the comments about needing a nappy are about right. My car more or less wanted to kill me all of the time. Remember there is no ABS on the brakes, no airbags, no stability regulation no roll cage, and you are sitting 6 inches off the ground. My car sounded awesome, one of the nicest sounding cars I ever encountered, and I think the Chimeara is a good looking car, nice interior too, and useable boot
However if it was even remotely wet, doing pirrouettes on roundabouts was not uncommon. On a sunny day with warm tyres and dry roads if you dropped it into 3rd and floored it the wheels would spin for 2-3 seconds and the car would dance all over the road, not enough weight really for that amount of power. Dont get me wrong I got the hang of it and stopped spinning off and skidding all over the place but it took a lot of concentration to drive it hard as it really wanted to kill you. It would hit 60 in under 5 seconds, top speed over 165 easily, so yes a reasonably fast car, with 500 HP who knows what that thing could do, if you can get the grip.
I used to joke that a good journey in that car was one you survived. Beware this is a lot of power in a fibre glass go-cart.