To be fare in the dry standard tune I think they are on the limit of wheel spin in first gear but then the car just pull in every other gear when giving it some. In the wet it's not great tbh but fitting a diff would make it better. Don't get me wrong it still handles like it's on rails but just wheel spins lol with a bit of torque steer.
i might be making some spherical bearing lower arms to help with that though.
have a look on Ian's Facebook page mark as I know your mates from along time ago and he's just had a block linered with close deck plate with custom Pistons and rods I think it around £3500 . I know you have no problems building engines etc so you can go your own way. He's also started work on the cylinder head as well he says it should see 500 bhp which is a bit to much for me as a daily.
cheers paul