chevy big block 454

[jose urbina]

I just bought a chevy 454 engine. I need help decoding it. The casting numbers are 361959 also has other casting number L10 75. on the flywheel side it has HI- PER PASS.
The pad on above the timing chain cover T1223TSD and the pad by the passenger cylinder head GB130341 please help me decode it.
thank you

 

[63Half-ton461]

361959.....454.......73-90...2 or 4 bolt

Pretty common mark IV block,

 

[63Half-ton461]

What casting # is on the head under the valve cover ? that will tell us a lot more about this engine ?