Carb spec questions....

[Caesar Naples <caesar@domain.elided>]

I recently decided to replace my carb.  I wasn't sure if it was the 
original model, and I didn't want to do a rebuild (long story).
So I ordered a "new" 2210, which is what my copy of the IHC Service 
Manual says was on it originally (oh, its a '78 SSII, 304 auto).

My question is about some of the specs.

First the main jets.  My books says "#53", but I found a "531" and
a "542" (but the "2" was upside down?) in the new carb.  The "542" 
was on the accelerator pump side.  I assume the "531" is close enough,
but what about the "542"?  Can I use that?

Next, the power valve.  I can't find the spec for that in my manual.
The new carb has a power valve with a "40" on it.  The old carb has a
power valve with an "11" stamped on the top (I don't have the right 
tool to remove it).  Should I stick with the "40" that came w/ the
new carb?  What's "stock" for the 304?

And finally, the accelerator pump adjustment.  There's no value listed 
for my year, but the '73 is listed as 17.78mm (.700").  Should I use 
this setting, or does someone have the correct one for the '78 304?
And about using this number... the manual says "Close throttle valves
tightly. Measure distance between top of air horn and end of plunger
shaft."  I read this as I should measure from the end of the plunger 
UP to the top of the rim of the airhorn, but there's almost no way you
could adjust it anywhere near 17.78mm if you measure that way.  Is the
right way to measure this from the end of the plunger DOWN to the slot 
in the air horn that the plunger comes through?

I'm kinda new to carbs (couldn't tell, huh?) so if anyone wants to offer
any other advice, feel free (stuff like "oh, don't ever do this when
replacing your carb" is greatly appreacited).

thanks,
Caesar