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I checked Autozone on-line. They sell the same flexplate for a 1979 460 as they sell for a 1996 460. The starters for a 400 and 460 are the same in 1979, so I think it's a safe bet that a starter that fits a1996 460 will fit a 1979 400.
Here's an update on my problem that goes back a ways....
A couple months ago I replaced the starter and solenoid.
It's been doing OK now but I only use the truck to pick up
building material and such and do not use it as often as I
used to. So the last 5 or so times using it, it's been ok.
Still don't feel 100% confident but hopefully that will build up
with continued successful usage.