I have a 1968 Camaro with a 327 engine. It has a Edelbrock intake with Holley 600 CFM Carb. It also had an MSD ready to run distributor. It runs really good when in the shop standing still at any RPM but under any load it spits and dies it I hit the throttle to fast. So I started checking over the carb and noticed that I have manifold vacuum is showing 37. It should be around 14. What would be the reason it is so high? And could this be causing my issue. I have seems to happen no.matter where the timing is set. Right now I have it set at about 12 initial and 25 total. I have tried from 9 all the way up to 15 advanced and it seems to do the same thing. Any help.would be appreciated..

 

I also have a free flowing 2 1/2 dual exhaust.

 

Try another vacuum gauge, as the MOST vacuum one can achieved with a fine vacuum pump, more than a rough pump used in evacuating AC, will only acquire 29.6 inches of water.
A troubleshooting aid, disconnect the vacuum diaphragm linkage from the secondaries and try again.
If accel improves, secondaries could be opening too fast.
The diaphragm spring will need to be swapped out with a stiffer spring slowing down the opening.
Once engine tuned, correct timing, mixture, etc., it should go from 600 RPM to 5K RPM at WOT in about 3 microseconds smoothly.

 

I used this gauge on my other 2 cars with Small Block Chevy's and they show as 14 and 18 so I don't think that the gauge is bad or not accurate, I will check the secondaries and see what happens.

 

Look at any vacuum gauge, they indicate from 0 - 30 Hg/in.
A stock engine, carb does not matter, should pull 17 to 20 inches of vacuum, depending upon piston ring seal.

 

Everett is right 37 is more vacuum then is in space. 14 inchs is low unless the engine is built with a large Cam.

 

The only scenario that comes to mind that can cause abnormally high vacuum readings, would be if you have a restricted air cleaner.
Test vacuum with the air cleaner removed, if you haven't yet.

 

DOH !!! ( Homer Simpson voice) The gauge is being read using the cm/Hg, so a 37 indication will be approximately 14.5 in/Hg.
Shame on us.