I'm reaching here a little Tbolt, but I can give you what I THINK, no KNOW. I'm pretty sure the 428 went out of production in 70. I'm not sure about the casting numbers on an intake, but I know a D1 block is a FT block and represents blocks cast in D-70 1-last year digit. I have no idea what ford might have done outside the automotive industry with the FE so take this all with a grain of salt. One thing I can tell you is the FT cranks have a larger diameter snout. If I remember correctly they're around 1 3/4 inches while the FE's are closer to 1 1/2. Sorry I don't remember the exact specs, but I think its pretty close to 302 intake size 1.78 and 1.45 but I'm not sure.
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