Not Ranked
The block is a '74. In Ford part numbers the first letter is the decade (A=40',B=50's, C=60's, D=70's etc..) the first number is the year within that decade, so 'D4' = 1974. The next number = for whom it was produced A=general line. Fourth #= WHO produced it E=Engine foundry. The next number is a descriptive, 6015=351W block and the last series is change suffix's. Yours is a late 74 block judging from the line changes. Hope that this is what you wanted.
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