Anyone know the horsepower for a 1970-1979 350 4 barrel out of suburban?

The horsepower for a 350 cubic inch, 4-barrel carburetor engine from a 1970-1979 Chevrolet Suburban varied considerably depending on the year and specific options. There's no single answer. Compression ratio, camshaft, carburetor type, and emission control equipment all affected output.

You won't find a single horsepower rating for all those years and models. To find the horsepower, you need to determine the specific engine code stamped on the engine itself (usually on a pad on the passenger side of the block). Once you have that code, you can consult a Chevrolet parts catalog or online resources (like some dedicated Chevy forums) to determine the exact horsepower rating for that particular engine.