It's not available to test-drive anywhere I know of. However it is MUCH easier to drive than the 427 Cobra. It's still a bit slippery, especially when supercharged (540-ish HP and about 430ft lb torque with high-end Super and intercooler) but it's much closer in handling characteristics to the GT40 MK1 than the 427 Cobra.
Unlike the Cobra, I've been able to adjust the over/under-steer to my liking much easier, though in completely stock form it's pretty great. Just in case you're wondering it MIGHT top out close 700PP. With the super/intercooler and RH it's around 670. With RS's and the permanent engine upgrades it might get into the 690-700PP range. So it's meant to be a competitor to the 250 GTO, not the 330 P4/XJ13/GT40, but only because it has essentially no downforce.
If you've got a ton of credits from the Tomahawk grind, I'd say go for it. I don't regret buying it and have been having a great time testing it on various tracks against other cars of its era. If you've only got 20mil, I'd hold off simply because there isn't really any races that pay well where it can reasonably compete.