string, the problem with the 289 was piston slap...timing only makes the noise more or less noticeable, that is all. It is also a way to diagnose piston slap. If you retard the timing to 0 degrees you will likely lose considerable performance depending upon what your timing is supposed to be.
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'68 C20 Longhorn 50th Anniversary 400/TH400
'68 C20 Longhorn 50th Anniversary 468/TH400w/buckets
'72 C20 Halfhorn (Longhorn w/o cab and front clip)
'69 Flxible Cruiser (look up ugly in the dictionary)
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