sb tuning problems

So the car ran fine before when first in i hadnt driven it much 34 total with the 850cfm quickfuel.
Took to a chassis dyno shop to get it tuned. Pretty reputable shop (lol) they said at WOT i i have 2.5" of bacuum so which i guess makes sense needs a bigger carb . They said go with a 1050cfm i realise at this stage this carb is massive for the cubes/cam setup . Everyone advised against but i gave the boys a chance to prove me wrong and put on a 1050.
The printout showed 330hp now up to 350hp 20 extra all the way up the curve.

Took it home and drove it . Sounded a lot crisper . Especially coming off the throttle while cruising . But a bit gutless. Checked the throttle and was only going half way. Fixed it up now and it went hard . I called the place and they said they were 99% that it was fine . (Very strange)

But since then at cruising the car dies at idle . Definitely plenty of power and torque downlow and no stumble or heaistation anywhere. Just the stalling .

About the heat changed fuel pump location and recently added the 1/2" plastiv spacer.

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