I'm going to build my 86 K30..for towing. It has a 350/465/205 60/14/4.10 set-up now.. I'm considering a 502 or stroked 454..for a motor. It's a single wheel rig now..but I'm considering a dually conversion. The dually axles are 4.56's too. What's your thought's on building the ultimate tow vehicle..on a buget??? What are some advantages of dual wheel rigs???