Your engine on dragmath shows about 700 hp. I don't know where you think it should be. For a 3450 lb car I don't think I'd run soft sidewall tires. They're made for a dragster or light car. I think you need stiff sidewall tires on your application. Weight is the key. You have a heavy racecar its takes alot to get it going. I would need to know more to help you tune. Gear,stall,cam,heads,compression.