New manifold still no low end power

[jimmybeus]

Ok here's the story. When I got the motor I was told it was a 350 come to find out it is a 383. The manifold that was on it was the Torker 2 by Edelbrock. I didn't have the low end power that I thought it should. I did some research and found that the Torker isn,t made for low end (I'm sure most of you knew that) so I took the Performer (2101) that was on the first motor and installed it. Put everything on it today and took it out for a drive and now it feels even boggier on the low end than the Torker was. I still have great top end. I set the timing at 2 degrees advance. That is what the Edelbrock recomended. I adjusted the front mixture valves on the carb. The engine idles smooth even with the lope from the cam. My problem about the engine is I am not sure what all was done to it. The kid told me that the cam and intake was a matched set and so by putting the Performer on it would that be what is causing my problems? The carb is the 1406 Edelbrock and that was the one on the other motor with the Performer intake. I am wondering if I need to rejet it even though the truck is from this elevation (6400'). Is there any other adjustments that I can try?
Thanks for any and all info. I have really learned a lot from this site.