oil dipstick no reading

i have a oil dipstick showing just a bit of oil on the end
i just replaced the oil pan seal and the seal needed for the windage plate
same seal.

i put 5 quarts in i dont have what i believe is the 7 inch
i have the other i believe is a 5

is the another available

does anyone know the lenght of a oil stick for a 5 inch pan

should the stick go in till it hits the bottom
than work my way up in some way

now for the dumb question

i put oil in the big hole on my valve cover ....just checking:)

its a new vehicle me


440 engine i think early 76

thanks for the help