If that is the last race in the Hall I used the Tommykaira ZZII, fully tuned. I lost interest in A spec points! Unfortunately it costs 50,000,000 I think, plus upgrades. I fitted a wing to get the adjustable downforce.
Easy money... do the second Special Condition Race at Costa di Amalfi. Any car with more than 250 HP should do it reasonably easily. Sell the Toyota RSC Rally Car for 26,500,000. I've lost count of the number of times I have done it. When you click one of the races to do it again a box will pop up. Highlight and click the right option to reset the series. Confirm with the OK button and then do the two races again. Easy money for 10-15 minutes driving. A couple of runs (plus the prize money) should pretty much sort out the ZZII.