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It is the new product run if the Old Revelle box scale B36. It is 1/184 scale. The wing span is 19 inches if I remember right. Released by Atlantis. Found out the B29 release has decals for FiFi. Hobby lobby just got it and this week it is 40% off. Might have to get one and the early model B25.I am almost your father's age and know how tough it can be. Your picture of the B 36 kit is a bit fuzzy and I cannot see what scale it is. About 15 years ago I bought a 1/72 scale kit of the same aircraft from a stall at an air show and gave it to my grandson. He made a good job of building it but unfortunately the decals (transfers to us oldies) were badly cracked from age and were virtually unuseable. It was a massive model. Good luck in building it for your dad. He will be delighted. Best wishes to him.
Thank you.Hate to hear the bad news. My condolences