Sound about right
The first Evinrude and Johnson V6 outboard was introduced in 1976. These engines were in production (with few changes) for 16 years (until 1992). The engine was basically a 90 degree crossflow V4 with two additional cylinders added to the top. Two separate 3-cylinder ignition systems were employed. The engines were available with three individual two barrel carburetors were never available with fuel injection and can be identified by the removable transfer port covers and deflector dome on the top of the pistons. They have been available in six different horsepower versions; 150,155,175, 185, 200, and 235