Did you carefully check the top of the left frame rail a little behind the engine mount (where it would have been covered by the body)? In the photo it doesn't look like you cleaned up that area. Sometimes the numbers are very faint. Charlie Stephens
'30-'31, front cross member doesn't have the two rolled 'beads' outboard of the 'U' bolts. '28 and '29 have this character...
The frame number will tell you which engine was installed during production. S/N on the engine was transfered to the frame when they were mated. ........................Jack
Yours is April, 1930. I have a May, 1930 Coupe. If you ever come to Ada, give me an email and come see my Mustangs and A's. www.picturetrail.com/bartmcneill