get a bigger engine from around same year, fit it but keep the head of the original, engine number will still read as a 1.3 but really u got a 1.8 or sumthin goin in there, so no need to pay higher insurance and no need to tell anu1 u done it. ive got a 1.4 98 civic with no performance mods, the accelaration is good until u get to 40 then it slows down but 8 seconds to 60 aint bad, top speed of 112 is a bit boring but speed aint everythin. civics are nippy cars, they are designed for realiability and there engines are amazingly prone to nearly any thrashing. Be happy that u got a 1.3 17 year olds aint even got 1000cc, id be happy with what u got but if u wanna get more power just put the bigger engine in n keep the original head.