I wouldn't unless you see signs of slipping or looseness. If there are markings around the head of the rivet where it looks like it has become loose and started moving around then cut it out and replace with a bolt....
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Pictures and more...
piston@zkast.com
'71 LWB
350/350T, PS/PB
Special options? Yes, RUST... Need some?
Garrett - Olathe, Kansas