timing the same for headers set up? lack power?

Its the lack of tune ability or parts to tune, like the thermo quad in a way.

gotta remember...that carb [holley 1920] was chosen to work with the coffee straw exhaust and not used in 5000 rpm with big tubes pullin the baageezuz out of it.

though i'm sure you could stick filed down paper clips into the bleeds to make them smaller...