[Russchiappa]

Hello, I am new to the forum. I like alot what i have read so far, so maybe someone could help.
Ive posted this elsewhere but have no success.
Chrysler 1958 392, fresh rebuild, with now 1500 miles on it.
10 to 1, msd electronic dist., mild cam, balanced /blueprinted, running a 750 edelbrock, with headers.Motor really purrs.
This is the problem: car starts, runs and idles well, but when i step into it, and rpm rises to about 3200rpm, i get "pinging", or the motor runs rough. Wont pull any more beyond this. If i accelerate slowly, the car will drive 75 , 85 mph.etc.
I believe i have the timing set to 12 degrees initial, 30 degrees total, all in by 2500rpm. I have switched the advance springs in the dist, run without vacuum advance, to no avail.
I am getting adequate fuel, and switched carbs from holley 750 to the edelbrock thinking the trouble was fuel related, but i am pretty certain it is ignition now. btw, matching msd coil, 8.8 mm wires (msd also )
something is amiss. Thinking of send dist. back to company for checkup.
Thanks for any thoughts.