It's like this, a stock LT1 is a 275hp and 320tq car, gets it torque at 2000rpm and has a flat powerband until about mid 5K's. They nearly put thier rated HP/TQ to the wheels because they were underrated. A stock 5.0 will put less than 200hp to the tire. Unless you have a real nice agressive H/C/I, your going to have a real tough time without a poweradder. Of course, there are other factors besides the engine that can determine the race.