12valvesmoker

What do they mean when they say afc housing forward? Are they talking about the fuel plate sled forward or what? Does anyone have pictures. Also would it be a good idea to put 3k gov. springs on my truck? What kind of performance am I looking at? Hows the smoke with gov. springs also? I have a #0 fuel plate and waste gate pluged(which I think that it does nothing, but have been looking at that waste gate kit from bd). Thanks.