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I had my head somewhere I won't mention and I certainly missed the fact it is a 91😖 As mentioned above, it is a completely different system and I believe conventional bleeding methods will work just fine. My bad.

No brake pump on a '91 model. To my knowledge it's just a standard dual master cylinder with a vacuum booster. The booster has a hose that connects it to the intake manifold. The Bosch ABS unit is a separate system connected to the master cylinder. It controls the braking to each wheel when it detects a wheel is locking up during a hard braking or on wet pavement. Even though it may use different brand parts, my GMC pickup has basically the same system.

You can weld anything less than 1030 together without issue. The lower the carbon (last two digits, i.e. 0.30% or less) the better.