No reason why not, but I expect your weight would climb a little, as you would have to put on more muscle to increase power and it doesn't sound like you have much fat to lose!
Many of us "oldies" on here quickly trained up to somewhere between 3 and 4 watts per Kg, some, like me, after a lifetime of little exercise. No reason why you shouldn't be able to do the same, so sustained averages over 200W should be well within your capability, health and fitness allowing.
This is assuming you are of the male persuasion, if not I would expect slightly less watts/kg, but still no reason why you should not get up there.
On flat'ish races I would expect you to have a harder time, as straight power is an advantage and weight less critical, but on courses like the mountain goat leagues your weight will be a positive advantage, and you will not need anywhere near as much power to keep up with most of us, who tend to be around 80Kg or more.
Last winter I went from struggling to average 200W over a 20 minute FTP test to managing just over 300W for the same 20 minute FTP test. We have all seen similar improvements in many chain gang and mount goat contestants from last winter to this.
Repeatedly sweating up the long Mountain Goat climbs as hard as I could seemed the quickest way to increase sustained power outputs ...
Just take care not to over do it, it be quite a strain on your body!
Geoff