LOL! OK, so no knowledge about something not on the internet. We'll just use NHRA factored hp numbers for Stock and Super Stock competition. "68" 383 330 hp and "74" 360 245 hp. Look it up. Your unsubstantiated claim that 383's have no potential has no basis in fact. Just looking at head flow will show you are wrong. Ever race against a 68 383 road Runner with an 11 inch clutch and a 4 speed? The perfect launch they had was impressive. They'd definitely clean your clock with a stock 74 360 duster. HP 400's (NHRA 250 hp in 1974) were the same category as a smog "supposed" HP 360, not even High Performance unless you throw a lot of money at them. By the way, Super Stock and Stock class cars are definitely in the scenario 4 catagory. My friends 383 Road Runner was all stock the way it came from the factory except for the mods I described, the cam, cast iron intake, small Carter AVS, and all. Same head castings as all big blocks. 13.0's in a B-Body. Your right, no potential there. Really, there is no problem making power with any MOPAR engine if you know what you are doing from a 170 to 440. Look at what the heads flow, that will tell you the potential.