328 pan and pickup on a 308

It's been done several times. Posts are in the old fchat.

Reportes were that just replacing the sump cover w/baffles & the pickup tube did improve the pressure drop on long sweeping turns. However it didn't completely eliminate it.

Other than a dry sump conversion, many race shops added a ~1" spacer for the sump cover, & extended the pickup tube to match. I have one of those set-ups, have thought about making reproductions.

Downside of the extension is that it lowers the sump below the rest of the underbody (ie: reduces ground clearance by about 3/4"). It's quite a reasonable thing to do for track only car.

Since the sump is almost directly between the rear wheels, this isn't too risky for a street car as long as you stay off of roads that may have ruts, & avoid manholes that have been raised for street repaving.