thanks.
unfortunately from other stuff that i'm coming across, looks like these are older carbs from the 80's/90's. So not sure if i'll be able to find any parts for it..
here's an excerpt from something i read:
"The 4010 was made in the late 80's and early 90's, with some running changes to the design along the way. It would be fine for a mild 350. The airhorn should be stamped R84010, check this as there were several variations in this carb series.
If it is a 4010 the carb should have an square aluminum body with the fuel bowls cast into the main body, dual inlets, and vacuum secondaries. It is not a double pumper. A manual choke was standard, but they can be converted to electric and many were. Parts are mostly interchangable with other Holley models (except for a few gaskets and such) and rebuild kits are still available.
Factory setup was #67 primary jets, #75 secondaries, and a 6.5" power valve. That should be close to what you need. One modification I do recommend is installing the quick-change kit for the secondary springs, which speeds up the process if you need to experiment with secondary opening rates. It only costs a few bucks.
If you want to read up on these carbs, there is a book "Holley 2010, 4010 & 4011" by Mike Urich, published by Fisher Books. It's the equivalent of the famous Doug Roe book for Q-jets. I got a copy at a Books-A-Million store, but it was a few years ago. Might be available on-line somewhere, too.
If you need an assembly diagram of the carb, it is still on the Holley site:
http://www.holley.com/HiOctn/TechSer...Info/4010.html
There's also one in the book I mentioned. Hope that helps!"
