just lifted 78 gmc sierra

I just put a 6" lift kit on my 78 gmc sierra all springs no blocks and replaced all my body bushings in the cab. and now my truck makes clanking noises every time i hit a bump or turn sharply. It just clanks and then its gone. But i dont want something to break so ia m trying to fix it but cant find any scrathch or scarred marks by the springs and bushings. Any ideas??

Thanks  

i had same thing on my sonoma and had my pops fix it i think it was the rubber block on my front sway bar.. just a guess sorry i couldnt really help..