I have a bored tbi 355 with moly rings, 350 hp cam, 10:1 flat tops, camel hump heads, flowtech headers, 3" exhaust, a k&n, holley 670 cfm tbi, holley projection intake manifold, accel high pressure fuel pump, and flowtech y pipe. Custom chip soon. desktop dyno says it will make over 400 hp and over 425 ftlbs.
Holley says the 670 cfm 2bbl tbi only supports 275 hp but mostly because they want you to spend a grand on a four barrel system or mpi. The hp restriction is because the computer doesn't have the fuel map for that much hp. if you get a custom chip and a high pressure fuel pump to fit your cam, heads, exhaust, intake, tbi, and estimated hp you will have no worries. All that will support a lot more than 275 and i know guys who bolted them to hot 383's and made serious power. The injector size to hp formula says the 85 pph injectors that come in the 2bbl will support 360 hp at 13 psi. I'm running a 45 psi pump, holley intake, cam, higher comp, bigger heads, and freer filter and exhaust. that is y the tbi holley says only supports 275 hp will support over 400 hp if you massage your setup.
