So, letís hear it, what would you suggest for curing a lean surge?
Without being there, knowing your needs and driving style, etc - I would have started by adding fuel. The previous double pumper's secondary accelerator pump was probably enough, and while mentioned you had other issues/things you didn't like it, I'm guessing a lean surge with that carb wasn't one of them.
Your way obviously worked too - ultimately you either take away air (stiffer secondary spring) or add fuel (accelerator pump on the secondaries). :-)
1969 Mach-1 Mustang
460 / C6 / 9"
Back in Dixie DSO 22 (Charlotte)