The Stovebolt Site Forums The Shop Area Engine Shop Suddenly, no power!

I put a newly rebuilt carb on my '48 half ton (216, 6 volt system) recently. Checked the points, set the timing, and all was good. Last week I was enjoying a ride along the Hudson River on a great road, doing about 50, when suddenly it felt wrong. The next hill I came to was a struggle to get up. On hills I normally go up in third with plenty of power I was now downshifting to second, then first on a steeper one. I limped home and parked it. I tried to drive it today but barely made it up a very slight incline to the street. I'm not much of a mechanic. What am I looking at here? Timing? The new carb? Demons?