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LD-340 intake problems

73roadchicken

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hey guys i recently purchased a LD-340 intake for my 340 road runner. i installed it along with a holley 4 barrel, just bolt and go carb..no tuning required. once everything was installed i noticed it was idling rough. i wasn't sure if its my intake, gaskets or carb causing this. can anyone help?
 
No, LD-340's have a heat cross over.

I assume the car was running well before this transformation? Rule of thumb is: Where were you last? I'd check for vacuum leaks. Perhaps you left a hose off or a port uncapped. If all that is well you might remove the carb and make sure your gasket has a squashed pattern all the way around the sealing surface. If no vacuum leaks then did you remove the distributor cap or wires? Check firing order. 1-8-4-3-6-5-7-2.
 
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