Well Samir, you are probably going to have to do a little bit of work.
With 8 miles in 1 hour you are probably towards the lower end of athletes in your age group, to get top the top 1000 in VLM you need to improve to well about sub hour for 10 miles, an improvement of about 25% of your current standard.
If you enjoy running join a club, get a coach, and can I suggest at your age don't get hung up by London Marathon.