VTEC in the sol is essentially the B16A
Si is the D16Z6

find those two and you are pretty much at stock. But just an FYI, any B-series engine (B16, B18, B20) along with D-series engine with hydraulic tranny will pretty much bolt into the del sol chasis (as all of the other civic chasis). Hope this helps... Dont go looking for "Del Sol VTEC engine" people will end up ripping you off... and half the time some people dont even know that the B16A came in the del sol 94-97. Just look for the B16A3 if u want an "original" stock engine in the del sol (i think 94-95 or something), but if u dont care get any d-series or b-series engine.