Are those B body calipers on A body spindles? The spindles should be swapped side to side - so the caliper is to the rear, and the bleeder is "up" at the top.
Those ARE NOT "B" body calipers.
73 up B body calipers have an entirely different flex hose location on the caliper.
And 70-72 B body calipers were the "pin type" design.
The op has 73-76 A body brakes, as earlier discussed.
