The fel-pro paper gaskets I have here have the number 90175-1 stamped into them.
If you have the gasket sitting so the number is facing up, the bolt to port spacing is this:
Left end bolt hole edge to edge of number 1/8 port = .750"
Left center bolt hole edge to edge of number 3/6 port = .925"
Right center bolt hole edge to edge of number 5/4 port = .980"
Right end bolt hole edge to edge of number 7/2 port = .695"

On these gaskets( I have at least ten of these here and they are all like this), the bolt holes are shifted about .027 to one end, in relation to the port openings(of the gaskets).
The tin valley covers I checked are properly centered.

Measuring from the outside edges of the end ports is 12.300", with the center of the runner dividers being 9.645" apart.

The Indy SR gasket has the bolt hole spacing as; .690/.920-.920/.690.
Port outer edge to port outer edge is 12.335, with the runner divider center to center also being about 9.645.

I checked a couple of heads here that have CNC'd port openings.
The runner dividers on a Victor head are 9.595 apart, and a std port EZ has them at 9.555 apart.
Interestingly, both an Indy MW gasket and a Mr. Gasket MW gasket have the runner dividers 9.555 apart, whereas the tin valley trays are more like 9.600-9.625.

Maybe one of you guys that has some of these TF heads on hand can check the distance from runner divider center to runner divider center.