86 engine questions

[Topher-x-01]

hey all i am working on my recently acquired 86 2wd chevy, it came factory with a 305, th350, but was told it now has a rebuilt 350 with 700r4... (i just replaced the tranny myself) but the truck came from cali and has ALL sorts of crap i want to get off... IE smog pump, and all the tubes running into the exhaust manifolds... can i just call the local parts store and tell them i need a new serpentine belt for a 350 with no ac (has it but its not even connected) and without the smog so i can bypass both those, the smog pump and the ac compressor?

also... removing all that crap and those little tubes going into the exhaust manifolds is there anything else i should be doing? there is some stuff under there i have never seen, any help and or some photos to would be greatly appreciated.. i really need to get it running better!
also it has a 02 sensor... i wouldnt think that year of truck would have one? who knows if it works or not.. i need to find out exactly what this motor is but havnt had time to go crawling around the motor for engine numbers...
thanks you guys