No problem, I know $450 seems like a lot.
GEN II 50cc Standard StarFire GEN II 50cc Standard Finnish [StarFire] - $150.00 : USABikeMotors.com, Star-Fire Motors and Parts
is just about $150 plus shipping and tax. Not to mention the form factor is good if you have the bike that was pictured in the second post. The carb fits direct to the cylinder head and the spark plug is angled. Scrap off the decal on the left that says 50cc so there are no legal issues. This was the DUI engine that I did for the guy with issues.
Don't forget to try google maps for directions and set it to walking it may give you a better idea of how to get from "A" to "B".