HRM back in the '90s did a street blower test on six different street kits. A few things that stood out were, the Magnussen was the prettiest setup, probably the most complicated, and with the single pulley set back then, it delivered only 6.0 psi. Good that you have extra pulley ratios as that's not much boost these days. I've also heard that the idler pulleys sometimes give trouble.
One of our members had that setup on his Pantera for many years, and ran several side-draft carb setups. He finally settled on dual throttle body injectors from (I think) GM trucks, on a custom manifold. That's right- those TBIs don't care if they're run as down-draft or side-draft, they're cheap and they flow lots of air. He may chime in. .