[olddog]

The 302 or 5.0 ltr has a 3.000 inch stroke.

The 351W has a 3.500 inch stroke.

Both have a 4.000 inch bore as you said.

The 351W has a taller deck hieght. That is the distance from the center line of the crank shaft to the deck surface that the head mounts to. The 302 deck height is 8.206 and the 351W is 9.480.

The 351W also has 3 inch main journals and the 302 has 2.249 inch.

Some parts interchange, but the 351W is significantly larger.