Conclusion... it makes at least 100 horsepower over a stock 260. It makes about 8 psi full throttle. It will ping and knock over 5 psi unless I add a bottle of high quality octane booster. It runs very smooth, and feels like a stock Olds 403 but has much better gas millage. It has stock exhaust manifolds that unite to a single exhaust pipe. Stock factory 260 cam. The engine has never been opened or rebuilt. Whoever had it before me took care of it and it still runs good. Unfortunately I did have to cut a hole in the hood to clear the air cleaner ducting (It is a second generation firebird). If this setup was installed in a larger car or truck, it would've probably cleared. The supercharger whine is significantly less audible with the long air duct installed. I do have another video about boost referencing the carburetor and distributor, and another video about fabricating a low profile distributor cap for the HEI distributor for clearance! There is also another short video of if running. Thanks for looking.