Having a little trouble with my 68' 327 SBC. Brand new rebuild and my first. Around 1,500 miles and i just re adjusted the valves while running. for some reason she doesn't want to start again after she is warm. I mean she starts but it is a challenge. Well that was until today, now she starts hard all the time. Here is what i have gathered so far with the timing light and the vacuum gauge. 800 RPM at idle 18.5 HG Vacuum (tiny drift- less that 1/4 HG) 10 Degrees Advanced Timing Mild cam. What am i missing? Oh and a mini high torque starter or gear reduction.