if it has a vtec engine and its an 89 it must have a swap.

the only honda product with factory vtec in 89 was an DA6 acura integra RSi + XSi equipped with a D15b.

as far as was vtec around, actually a variation has been around since 1969 when Alfa Romeo released the 1969 spyder voloce which had a hydraulic variable valve timing system.