Widest tyre/tire for 1990 80Q?

[elweasel at bellsouth.net]

If it was a normal daily driver I would tend to agree. However this poor 80Q is a future Lemon's Racer(next weekend CT) and AutoXer(20 events). So the wider tyre, larger tyre patch. In AutoX you should see the people putting 245 on 7" wide rims. Looks funny but they are fast in the corners. Anyway I need to order the tyres and I first need to know what size to order. I could order standard 205 but more is better if it runs. I think I'll try 225-50R15 Hankook Ventus R-S2. The only rule for tyres is treadwear over 190. So no R-compounds. What do you guys think?