Strange problem with 6-71

This is not an all out race application. The car will probably never see the track. So taking that into account I figured 1500 cfm was a little much. It was running rich with the 750's and is a little lean with the 600's. I am going to up the jets to compensate. Running down the road a little lean is o.k., a little lean at w.o.t. is not, so the change in the jets.

Jack