Totally agree with HRL and Soggy. On the valve adjustment, since it is already running, you could just warm it up and do a quick check with the engine running. I have done this many times, it is a bit messy but works even though a bit shade tree. If the valves, timing, compression, vacuum and all the other factors are correct, it may be something bigger than what is going on now. My first thought here is what kind of valve grind was done, to what specification?
