Because you can hang the calipers so no re bled. You can take it off at the upper ball joint and leave the upper on the car so no alignment needed. Only hard part was undoing the steering shaft.For what you're doing, out the top. I've done it numerous times by myself in a short time with an engine hoist and leveler. I don't know why most people I see pulling an engine still use a carb plate adapter when an engine leveler is under $40.
The only reason I see that out the bottom is better would be during a restoration. Seems like re-doing the alignment and bleeding brakes is just extra time, effort and expense wasted.
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