This is per Wallace Racing's database.
1969 400 290 HP YD A 10.5 254 46 1-2 7029060/70 45 degree intake Block Casting # 9790071
Per the same database, the YD code in 73 is a 455. I would say you're correct that you have a 69 400 that appears to at least have the heads it was born with, or at least had the possibility of being born with.
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-Jason
1969 Pontiac Firebird
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