Thanks for all your help, from all the replies it does sound like the Monogram kit. I agree from the size it has to be a 1/48th scale model. The canopy does look to be one piece and you may not be able to tell, but it looks hand painted on the fuselage. It is definitely a plastic model, I remember us building it together. I was a model airplane freak even at that age, my Grandpa did not know much about planes. I don't think he would have added the radar, but who knows. Did Revell come out with a 1/48th kit back in the 70s? If the canopy was one piece, did the box art look different?