[Rev]

The '67 289 with a 4-V has about 225 hp from the factory. The Hipo version had 271hp The '70 302 with 290 hp was the Boss 302 engine and it was intentionally under rated by the factory. You don't have anything like that. The hp ratings before about 1971 or 1972 were gross hp. More modern engines are rated as "net hp" which is a lower figure than the gross figure.

Long ago, cams were referred to as "3/4 race" for a more streetable cam and "full race" for a not so streetable cam. These terms were never very precise. What you most likely have is a hydraulic lifter flat tappet street cam for some extra power and good driveability.

If you really want to know what kind of power you're getting from that 289, you need to put it on a DynoJet for a rear wheel hp pull. Don't be too surprised though at what the numbers are. from the combo that you describe, probably 175 rwhp or there abouts is what you may get.

Usual prices in Houston for 3 pulls on a DynoJet are about $75. I have an appointment in a week to do mine again. It's really the only objective way to get reliable hp numbers. You can get some idea from drag strip times or G-tech data as well as to your engines power.

Rev