Metro engine is easiest swap if you want a bit of extra power in a Mini, you end up with similar to a hot 1275.
Re classics for teenagers, anything small and not too powerful would be best, they're easier to handle, brake better and fit into smaller gaps. Obviously any classic in a crash will be considerably less safe than a modern car.
Old Fiat 500 would be an alternative to a mini, or Hillman Imp, there are many others in that sort of size bracket. Also original hot hatches are being considered classics now, Vauxhall Novas are fun.
Metro engine is easiest swap if you want a bit of extra power in a Mini, you end up with similar to a hot 1275.
Re classics for teenagers, anything small and not too powerful would be best, they're easier to handle, brake better and fit into smaller gaps. Obviously any classic in a crash will be considerably less safe than a modern car.
Old Fiat 500 would be an alternative to a mini, or Hillman Imp, there are many others in that sort of size bracket. Also original hot hatches are being considered classics now, Vauxhall Novas are fun.