427 tall deck
All 366 - 427 truck tall deck blocks had 5140 forged cranks for heavy duty use in 2 ton trucks.
These are not as strong as current 4340 forged cranks however. And they are 20? years old before you get to them. The real value of a tall deck block for bracket racing is to use a 4.250" srtoker crank and make a 496. Also the free 4 bolt mains. Remember they cause header clearance issues in stock chassis cars and aftermarket heads with raised exhaust ports make it more so.