Nice job. Speedgoat is a rude introduction into mountain running, for sure. One stat that I use to gauge how tough the course will be is to take the total elevation gain and divide by the length of the course so you get an average gain/mile. Speedgoat has 14,866 feet of gain and the website says the 50k is 33.95 miles. That works out to 431 feet/mile, which is insane. I think the toughest races I've ever done were 180-200 feet/mile.