I've been wondering about that issue:
5. Tomb of Dracula #6
but probably You had it listed later on.
I thought You have it listed later but knowing You are adding 1983/1984 and it's from 1980 I know there is something not right.
What If, despite being out of continuity, had interesting backstory "Untold tales of marvel Universe", presenting things from Marvel Past:
6. What If #23 "The First Celestial Host!" (Celestials)
7. What If #24 "The First Eternals" (Eternals)
8. What If #25 "The First Uni-Mind" (Eternals)
9. What If #26 "Outpost on Uranus" (Eternals)
10. What If #27 "Kree Encounter!" (Eternals)
11. What If #28 "New Life" (Eternals)
12. What If #29 "...The Search for the Great Refuge!" (Eternals, Inhumans)
13. What If #30 "Moving Day!" (Inhumans)
When I previously asked You about it You said
And, on what if issues I have been attaching to specific issues they diverge off of in the more reading section. What issues do those diverge off of?
but I must have missed that question. I think those stories should be included in main list. They are genuine 616 backup history stories which explaines eternals and inhumans origin. there are regular "What if" stories in those issues but I'm not talking about them.
The same for What if 35 which presents (besides regular What if story) backup feature "And Thus are Born The Cat People!" explaining their origin. Also think it should be in the main order.
Bizarre adventures 31 Hangman's appearance in "Gore Galore"
Bizarre adventures 33 - again You probably have it listed later but it's last comic from 1982 You haven't listed