MOPED ARMY

Fix it and blast. Your top speed is your top speed.

But also I dunno if grandes did the same speed thing as ciao. I thought they were all 30mph but I'm often wrong about those kinds of things

That's not gonna tell you much. The speed rating is determined by the ratios in the final reduction gearbox.

https://myronsmopeds.com/2020/12/vespa-speed-versions/

so from what i can cross reference, appears 20 mph had tiny carb 10 sha. 25 n 30 had 12 sha both with 49 main.

Everthing elese the same except thme exhaust pipe. read the numbers and check... Or get her running and test ride. I would never buy a non runner for 500 because a running moped is priceless. Dont get me wrong but i have paid 500 for non runners but tyet were something special.

You'll be fine. Pretty easy to rebuild too! Which you need to do. Research Vespa intake patches and opening up the intake(put a hose clamp on!!!)

Vespa crank seals have led me down some wild carb tuning paths. Seriously just replace them before anything else you'll think it's a ton of different things before you replace them...Easy to do as your gonna wanna open that intake and have to split the cases for that sooooo.