HSV 1 positive through blood test =[LIAISON assay using chemiluminescence immunoassay (CLIA) tech.] Index=1.47, how likely is it false positive?

Not false positive. False positive tests for HSV1 are very rare. Half of all persons your age have positive tests, so nothing unusual there. Most likely from an oral infection in the distant past.
Nobody knows. The "received wisdom" is that everybody who tests positive has been infected at one time or another with HSV1, and is able to transmit the virus, even if they have no symptoms or signs. As a lab expert, I know that tests like these are fraught with pitfalls and with no gold standard, who knows? And what are you going to do with this information? Stop kissing? Forego relationships? That'd be crazy.