Its where the lifter guide sits on the block. this is the metal guide that holds the roller lifter in place so it does not spin. the non ho block does not have enough cut in this area. At least mine doesnt. As far as cam journal sizes, you can call summit and ask for the specs. they will be more accurate than me. I believe the roller cam has bigger journals.
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5.0, Holley heads, 1.7 Scorp Rockers, Stealth intake, Holley 600 carb, Holley Mech. Fuel pump, MSD 6Digital, MSD distributor, Hotchkis upper/lower rear control arms, FMS B Springs, 3:73 (8.8) rear.
Production # 9,377
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