By hill, I mean a very slight rise...most people would say it was almost flat. I've never driven it more than 100ft so don't know the top speed. Gravity makes it go 5 mph, maybe... engine is running. It just completely bogs down with the slightest rise. Would putting it back to stock timing make more torque? Your gasket material looks like the "good stuff". The one I got from Paul was just paper and fell apart as I carefully took it off. I looked at Paul's website and while new gaskets are $4, the shipping is 26.90. So, I used some Victor Reinz material made my own. Seems no sense putting it back together, expecting different results....maybe someone else needs a project....btw, gas tank is spotless and has been...