Issues w/ a targetmaster 350

[ZMAR]

I recently bought an '84 k10 scsb. It came from the factory w/ a 305 but the PO swapped it a LONG time ago. It looks like its got 305 components on it. The quadrajet carb would hang the choke open when you gave it throttle. There is a mall lever under the electric choke that I would push down and it would idle back down. I zip tied it where it would stay down and now it spits and sputters when I give it the throttle. When going down the highway I can floor it and won't drop down or speed up at all. Any ideas on what I can try?
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