Sure, here's an updated Python function that calculates the weight of a block of any material with any dimensions:

``` 
import numpy as np

# Define a dictionary of materials and their densities in g/cm^3
MATERIAL_DENSITIES = {
    'ice': 0.92,
    'iron': 7.87,
    'aluminum': 2.7,
    'gold': 19.3,
    'lead': 11.3,
}

def calculate_block_weight(length, width, height, material):
    # Check if the material is a string or a float
    if isinstance(material, str):
        try:
            density = MATERIAL_DENSITIES[material.lower()]
        except KeyError:
            raise ValueError(f"Invalid material: {material}")
    elif isinstance(material, (int, float)):
        if material <= 0:
            raise ValueError("Density must be a positive number")
        density = material
    else:
        raise TypeError("Material must be a string or a number")

    # Convert dimensions to metric units
    length_cm = length * 30.48
    width_cm = width * 30.48
    height_cm = height * 2.54

    # Calculate volume and weight
    volume_cm = length_cm * width_cm * height_cm
    weight_grams = density * volume_cm
    weight_pounds = weight_grams / 453.592

    return weight_pounds
``` 
Here's how to use the function:

``` 
# Calculate weight of an ice block
weight = calculate_block_weight(18, 12, 1, 'ice')
print(f"The ice block weighs {round(weight, 2)} pounds")

# Calculate weight of a gold block with custom dimensions and density
weight = calculate_block_weight(10, 5, 3, 19.3)
print(f"The gold block weighs {round(weight, 2)} pounds")
``` 
The function takes the length, width, and height of the block in feet, and the material as either a string or a float representing the density in g/cm^3. The function converts the dimensions to metric units and calculates the volume and weight using the given density. It then converts the weight from grams to pounds and returns the result. If the material is a string, it looks up the density in the MATERIAL_DENSITIES dictionary, raising a ValueError if the material is not found. If the material is a float, it checks that the density is positive.
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