A better answer? Seriously? Did you read the thread you posted? It was a freak, he's never seen a 20g make that much power before.
I understand this is the newbie section so I'm going to say this in the most non bashing way I possibly can. Since you clearly can't understand common sense, multiple educated answers, or any kind of research, I'd simply say throw a vf39 on there and crank the correction factor to 2 or 3 if you want a "500hp" car.