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The Chevy guys need to come on board here, but what looks good is a 383 with under 10/1 CR, 600 CFM Holley vacuum secondary or similar in an Edelbrock.

Take a look at Edelbrocks cam/intake...

Unless you're running a fairly high static compression ratio, you won't gain anything by running high octane.

High octane is all about slowing down the burn rate which helps to prevent detonation....

Tim is correct that 2300 rpm all-in is workable.
Thing to look out for is ping at part throttle, it probably won't happen, but it can so be aware.


The 17"-18" of vacuum at 1500-2000 rpm shows...

Just in case....http://i49.photobucket.com/albums/f278/C9x/Tech%20Articles/PCV.gif

Don't go to the trouble of pulling the timing cover until you get the other stuff squared away.
Right, now, a cam off a tooth is a possibility, but do the easy stuff first.

If you're familiar...

Keep in mind that if you don't pick up to 17"-19" vacuum at 1500-2000 rpm with no load on the engine things still aren't correct.
If it does, then everything is probably ok and you just need to...

Did you note Skids72 comment about setting the timing with the vacuum advance disconnected?

If you don't you'll end up with retarded timing.

With the cam you have and assuming the timing is...

You need a vacuum advance distributor with vacuum source selected to manifold vacuum and not ported vacuum.
If not, your car will most likely overheat in low speed traffic and at idle.


I've had...

Go to Amazon - http://www.amazon.com/s/ref=nb_ss_b?url=search-alias%3Dstripbooks&field-keywords=Holley+Carburetors

Buy two of the manuals listed.

Holley Carburetors by Dave Emanuel - an SA...