Edelbrock 1406 running lean

if it's surging like I expect is the 'tell', stick smaller primary rods in it and possibly weaker step up springs...However you may want to set it up like the 1405 -100 primary jet .070x.047 rods, instead of the 98 primary jet and .075x.047 rods that the 1406 come with.

hope the link helps as well..

http://www.partsgeek.com/assets/perf/full/2549-03133063-1229497.pdf