Terry,
On my Canton
oil pan I poured in six quarts water (mine is a 7 quart pan) and the
oil level came up to within about 3 1/2 inches of the rim. If you have the 289 with the dipstick in the side of the pan I would expect the
oil level would fall just below the dipstick.
As far as
Amsoil...it seems to be pretty popular at the drag strip witht the Mustang guys. If there was something bad about
Amsoil we would all know pretty quickly because a lot of people around here are on top of things and get the word out if something is less than it is supposed to be.
Clois Harlan