What to do...

I would say to email them and find out what you are most likely to have. But I would imagine your safe with that converter given that most of them came with dual anti-ballooning plates. If it has dual plates, it probably would have felt like trying to lift a manhole cover.
I don't even have the original order number anymore.. it was in the box, but with moving and everything I haven't been able to find it.
But I did check the website... and

"9 ½" Race/ Street

Features - Dual anti-ballooning plates (where applicable), triple bearing package, full furnace brazing, all fins are hand welded for extra reinforcement, bulletproof sprag and stator design great for bracket cars or serious street cars. Super efficient."