In the 1227747 there are 2 ways to tune BPC althoaugh it's called a BPW in this ECM
"! Is a constant "BPW CONSTANT FOR EGR OFF" Seems the SBC and BBG have simalar settings in several chips.

What does the number refer too? Adn how far should it be adjusted to get BLM within reason before going to VE table.

The second way is a main table "BPW CONSTANT FOR EGR ON" Since this conversion motor does not have an EGR it is disables in constants. So these numbers should not mean anything?