It sounds like you want to score a dataset.
Make a mock dataset that has the values you'd like the Y for, original dataset with LCFF=0.
Then use a score procedure to generate your output.
Proc Score, PLM, Code statement or Score within PROC REG.
http://blogs.sas.com/content/iml/2014/02/19/scoring-a-regression-model-in-sas.html
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