In need of emission system help for my 76 GMC

[streetmaster42]

Im kinda dealing with a tuffy of a problem with the emission system on my 76 GMC. The problem is im not sure exactly what all i need to pass the peekaboo test in the County i live in here in PA. The county of Fayette, is one of 42 that dont require you to pass an emissions test. You just have to pass the visual anti-tampering check test, before they will slap that sticker on. I got My 1976 GMC Sierra back in 1998, came factory with an I6, and a 3 on the tree. I tore it all apart that year to do a ground up resto, because there was just to much rust to mention. I since then replaced the motor with a 350sbc, TH350, a painless wiring kit, did the frame, got a better bed that i just tore back apart due to rust, and im redoing the crappy job some schmuck done on my rockers and cab corners, I-NO LOL. Ive got the cat for the exhaust, im just not sure what emissions crapp they put on the 76 modles with 350sbc. (Oppinions please) sombody please