I have a 55-56 272 that is bored to 292. I was told it had about 20k miles on the rebuild and was replaced with a 312 with Tri-power in a 56 T-Bird. The valve covers say ThunderBird V8, but that is a decal and means nothing. It has a 1960 2 barrel intake ( Autolite/Holley not the three bolt flange, no exhaust. It has been in storage for years. It has been taped up and had antifreeze in it until recently. It turns over with a Socket on the crank. I have too many projects to start on this one. 
This is all the casting numbers I can find
INTAKE MANIFOLD
C0AE-925-F, 2L5
BLOCK
20 ECG BIFA
HEADS 
Right 1K1- DI6- 8U AND 6090
Left 1K2- BTC-  D8.AND 6090
If these head numbers mean anything to anyone please share,as they match nothing I can find
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