Hi Everyone! I am a long time reader and first time poster! After using the info I learned off this site and a good number of techbooks I took it upon myself to rebuild my '76 350 small block. Everything since break in has been going decent, but I have a small issue I am concerned with. In Park or Neutral it idles up at 1500. But when I drop it into drive it goes all the way down to around 600. This seems like an excessive drop to me. I had to set the curb idle high so that when it went into gear it wouldn't stall out. That being said, it runs fairly nice, I just hate when i go to park and the thing revs way up! Here are the specs: 355, .030 over, Holley 670 Street Avenger, TH350, Stock heads, Edelbrock Performer Intake, Slightly larger cam than stock, It gets around 11 in/Hg at idle, vacuum gauge doesnt seem to jump around much, just slight twitches around the 11 mark. Timing is set at 13 degrees. Thanks in advance for any advice!!