new intake and carb...issues

Ok a buddy of mine recently aquired a 67 coupe 289 C-code. Decent looking, rebuilt engine and tranny. After finding the c code was healthy, we decided to add a performer intake and 600cfm carb this weekend. Well today we took it for a ride and the performance is noticeably worse. The timing was set at 12 degrees. the carb mixture screws were adjusted. We also did the petronix ignitor 2 and the flamethrower coil (.6ohms), new wires. cap and rotor. The symptoms are....it stalls when navigating slowly in reverse. On right or Left turns it stalls. It wont start unless you have the pedal mashed. Im starting to think the carb is a factory mess up. Its a manual choke which is open and not a variable. Everything else on the car is stock. The exhaust manifolds are the emission type that run a tube into the stock carb, we removed the tubes, and now he has 2 small holes in his manifold (passenger side) soo it leaks. We didnt hook up the C-4s vacumm to the carb, only a vacumm port off the intake...does that matter? I got a vacumm guage on the carb and it read around 15-20 lbs depending on the degree. with more advance came more vacumm. It seems if I changed the timing from 6 degrees to 12, it wouldnt change anything. I did remove the vac advance when doing the timing. Well thats all the description i can give. Thanks guys

Mike

Ps. Are the heads different on the emission equipped cars? This thing has small spark plug threads, (uses the 5/8 type plug) and just doesnt look right. I bet these heads are a major restrictor on the performance level...correct?

its an edelbrock. I am familiar with a adjusting floats on a holley, but not with the edelbrock. I have the owners manual which probably describes it, but just to make sure....where are the floats located on the edelbrock? internally? On the holley 4160 the floats are right up front and in the rear (easy acess to the needle) but this carb looks nothing like the holley. Ya this car is definetetly a dog, A c-code with bigger combustion chambers.....talk about a low compression motor. so much for the edelbrock way of bolting on and running/setting and forgetting. .

Mike

well went to adjust the floats, and found that one of the metering rods was bent, and the floats were out of wack. Fixed everything up, and it did improve slightly. how much timing should i have on this thing to run it properly?


Mike

ps It's a brand new carb.