I had a 770 SA on my old 383. Never got it to idle clean. It would gas you out of the garage. Spent forever getting my timing perfect. Didn’t work. Changed my power valve because my cam didn’t pull much vacuum. Didn’t work. Dialed in my idle mixture screws for highest vacuum and RPM. Didn’t work. Never got that carb to idle without making your eyes water. Ended up doing a rebuild on the engine for other reasons. Sold the street avenger and bought an AED Holley hp 750. Much much better. Great carb out of the box. When I talked to AED on the phone I was concerned with the old wives tale that street cars and automatics need a vacuum secondary. Guy on the phone told me that “unless you have a 300hp slug, mechanical secondaries are fine”. And he was right. Have never had this “bog” you hear of. Anyways, sorry I can’t tell you how to clean up your carb because I could not solve that puzzle either. I recommend a carb from AED or one from quick fuel. I also run no choke and have no starting issues in winter. I live in wa state so it’s not terribly cold either. One pump to the floor and it fires right up every time. Good luck!
383, 10.3:1, etec 200 heads, isky 280 mega, holley 770,
th350, 2600 stall,
12 bolt, 3.55 eaton posi
no time slip yet
just got out of paint
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ppg arrival blue metallic
black SS stripes w/ blue pearl