carb. crazzzzyness!!!!!!!!!

I really feel your pain; I (upon advice of an Edelbrock tech whom I called and described what engine I had and what I wanted to do with it) have on top of my rebuilt 340 in my Dart GT a pair of Edelbrock aluminum heads, Edelbrock Air Gap Intake, and Edelbrock 750 carb, all new components bought new last year and installed as part of the engine rebuild. Lately the 340 pops and produces mini backfires, hesitates and then surges when you give it any gas, and I've had three different garages look at it w/o any success. I'm beginning to suspect the carb is bad, and Edelbrock's answer when I called and discussed the problems I'm having was to tell me to remove the carb and ship it back to their shop in California to have it examined. I was hoping they'd have a regional presence in my area where I could make arrangements to have the 340 and its carb diagnosed, but no such luck.
I subsequently found a different shop here in Franklin, TN, about which I heard good reviews, and e-mailed them re: the 340. I desctribed my setup, and the reply I got back was this:

"John,
Thanks for contacting us.
We don't work on cars with Edelbrock carbs. It's not worth our time or your money. If you'd like, we can install a new Holley HP carb and dial it in perfectly for you. However, our shop is full and we wouldn't be able to do the work for a couple of weeks. Feel free to call if you'd like to make an appointment.
Sincerely,
Mike"

Once I got done laughing, I realized there is quite the contingent out there which has no respect for Edelbrock's product. Do y'all think that if you're using them on Fords or Chevrolets they're great, but they just don't do well on Mopars? Do some Edelbrock carbs simply resent being installed on a Mopar engine?