Not exactly Terry ... this is the Martlet Mk.VI or in other words GM FM-2 Wildcat. Its engine cowling was the longer one , also the fin and rudder were enlarged.
Here is the clue what has to be done in order to convert the Tamiya F4F into the Martlet Mk.IV.
The entire review here....
Tamiya 1/48 Martlet
"The main change from what is provided in the kit is to change the cowling, which is shorter in chord on the Martlet IV than on the F4F-4 and replace the engine. I used a Cyclone from an old Monogram T-6 for my replacement engine in this model.
The modify the cowling, the modeler needs to put off the rear portion of the cowling, at the leading edge of the cooling flaps. With the fuselage assembled, one need only glue this ring into its position on the nose, then putty over all the flap engraving and sand smooth. Then sand off the upper lip intake on the cowling, and cut out the two cooling flaps in the upper rear of the cowling.
Additionally, the Martlet IV uses a different prop from that supplied in the kit. I used a prop from an old Monogram Dauntless that was in the spares box, as it was the right size.
Once these modifications have been made, you now have a Martlet IV ready for painting."