Could "The Unseen!" (Fightin' Marines, No. 32--Oct., 1959) be Bill Molno on pencils and Fraccio on iks?
If so, why the long head shapes? Maybe "Remembered Moment!' from Unusual Tales, No. 17 (July, 1959) provides a clue or two. Here are the long head shapes from the Fightin' Marines story:
And, from Battlefield Action, No. 29 (March, 1960), we have another entry which ties Bill Fraccio (or, at least, the artist I've i.d.'d as Fraccio) with the long head shapes of "The Unseen!" (Are you keeping notes?) The entry is "Lucky Dogs," and here are some sample faces:
Same guy. And, just in time for the final panel, up pop those familiar elongated heads:
This close art-comparison work has given me a headache, so I think I'll sign off for now....