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SBF Decking
Decking is always a good idea to insure an even plane surface for mating the heads to the block.
You made no mention of what size & year block you have. If you have a 351W, keep in mind that the earlier blocks had a shorter deck height to begin with, by about .020". This is important and critical to piston selection so you will have ample valve to piston clearance.
Tony
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