280z in-line fuse from battery cable

[AZDatsun]

I want to change my positive cable out and move to maybe an in-line fuse instead of the fusible links to the fuel injectors .. anyone know what fuse size would be good?

I am referring to these specifically

 

 

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[Zed Head]

They're the green ones.  Same as used on the headlight circuit.  I've never found a good conversion tool or equation for converting slow blowing fusible links to fuses.  Seems like it would be a thing but it's hard to find.