[A1971Blazer]

I always use GXL wire in the engine compartment and TXL everywhere else.
They have better insulation and are best for vehicle wiring....
anywhere there's a high amperage wire....I use a fusible link.

I bought the M&H upgrade kit for my '67 build, it came with a heavy duty 8 gauge additional feed wire with a fusible link that goes to the fuse block to increase the available current....
It plugs right into the bulkhead connector.....it also has several extra heavy duty fused feed wires in the block for accessories.