Yep! It's "Mild" 351W as it's no nitrous, boost, and stock crank/rods. Easy way to tell if its a 351W vs. 302 block is the 351W has approx. 1 inch rise from the Dizzy to the "Lifter Valley" where the intake sits. On a 302 the "Lifter Valley" is about flush with the dizzy mounting surface. Of course you're fucked if its a stroker as there's no way to tell by looking at it.
302 "Boss" Block (Boss is not exactly the same a regular block, but the Dizzy portion is)
351W "Boss" Block
How do you know what my sack looks like? Did the pics from my Vasectomy get leaked???