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I think that the 79 block may or may not have a mounting pad for your power steering. The head should be the same.
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PS mounting pad is finish machined starting in late 1978.
The head casting is not the same. 81-newer heads are closed chamber, casting number 61040. 79-80 heads are open chamber, number 61032 or -36.
The 79 long block will swap in as an assembly, but will be down on power due to the open chamber, low compression configuration.