Replacing Fuse Block
 

I need to update my old-style fuse block, but I don’t think I need a new wiring harness (the wiring looks new; it’s just an absolute mess / needs thinning out).

I was thinking about getting this 20 circuit block from painless: https://www.painlessperformance.com/wc/30003

Anything I’m missing? Is it relatively simple to make this conversion? It looks like my current fuse block has 2 pieces, so I’m not 100% sure this one will work.

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72 Blazer with 1990 L98 350 TPI engine swap