Nice job. You're getting closer, but I still can't seem to get past thinking that the MC might be wrong for your application. That looks like the ones that disc brake trucks use. Drum/drum boosted trucks tend to look like this
If all else fails, you can get the booster with MC from Oreillys for about $150, and then they'll give you $30 back for a core return off that for your current booster/MC. Keep the bracket and push rod to the pedal to use.
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