If it is 454, I am guessing that it is not a truck block. I only have seen those in the 427 and 366 versions. If it is the 9.800 passanger car block in a truck, most of those will go .100 for sure they will all go .060 Truck block is basically the same except it is 10.200 tall. All truck blocks had 4 bolt mains to my knowledge.
Ed