i was on the same boots as you when i was 16-17 i wanted a car asap, but i didnt until i was 18.
If you wait, you can get more money saved up for a EFI car not a carby...
carbys requires more maintenance...which could be more money and give you more headaches...

I did the same and i picked up a EG vti with d16y1 vtec engine clean as a sheep for 4.7k.

but in the end its all up to you. i'm just suggesting not to rush and play it slow and safe.
good luck