I think what I'd do is try and spread the load across several columns and several rows. I'd get myself some lumber, say 2x6 pine/fir, and stain and seal it. I'd run two 48" lengths vertically behind the mounting plates of the bar, with the bulk of the 2x6 upward of the bar (or tight against the ceiling, as space allows). This lessens pullout force on the system.
Fasten the lumber to the masonry using sleeve anchors or toggle bolts, 3-4 per side. Try to hit the central area of the blocks to reduce the chance of blowout. Use an appropriately sized masonry bit and hammerdrill with light force.
Anchor the bar to the lumber using 7/16" x 1-1/2" lag screws, or run 3/8" carriage bolts through the lumber from behind before you mount it to the masonry.
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With this approach most of the torque load is applied to the lumber. The resulting shared load is very unlikely to tear out of your wall.
If you aren't concerned about the appearance of the masonry down the road, use 100% silicone or construction adhesive in a heavy bead down the back side of the lumber as an insurance measure.