I got your back
SaleenGTS 
More than that, I LOVE Ferrari's.
Just because in stock form some of the Ferrari's aren't 1/4 mile monster's doesn't mean they won't slaughter a stang on a road course!
The F40 was rated at 470hp, with the originals rolling off the line at about 2420lbs. They were in the spirits of the true old Ferrari's. Bare bones, bascially steet legal race cars. The F40 is almost unstreetable, turbos kick in about 6000rpm on the V-8. Seems strange that the turbo's went out, supposedly the F40 is one of the more reliable Ferrari's.
Anyway, with a power to weight ratio of about 5.14:1 and a Viper GTS coming in at 7.3:1, you can tell the Ferrari means business.
The Calloway Vette was probably pushing about 3300lbs. That means to equal the power to weight ratio of the STOCK F40 it would need about 640hp.