To understand the potential problems with the Judson you have to understand a little of their history. They made blowers for EVERYTHING. I'm sure some models work better than others, but they didn't seem to do much development. It was really a recipe of schtick/science/economics. I've been told that the Holley carb that wound up on the Sprite unit was also used on 6cyl truck motors. It's too big for the Sprite, AND it's orientated 90degs from "normal". The problem with that is you can lose fuel supply during cornering. I struggled with this off an on. There's an accelerator pump that you can disconnect. There's other stuff, but I don't want to ruin the surprise...

Seriously, if it's the way Gramps had it, it's what you should do. (IMHO) if you encounter any issues I'll be glad to jump in with my specific experiences.
FWIW Folchi uses a Judson with a Webber DGV on his Sprite...
After a few years, one day I just had enough. The quirks (the clatter of sliding veins etc) were no longer endearing. They were annoying. I pulled the Judson. Then I was horribly dissatisfied with my 948's output...

That led to a car shuffle and a 1275. Now my Judson is in a clear tote on a shelf and I'm planning on putting it on the show car I'm building in my mind now, but may be real someday.
A couple of random thoughts; You may not want to break your new motor in with the Judson. It really does add quite a bit of heat, and pressure. Plus to appreciate the Judson's power boost you have to drive a normally aspirated 948 first.