you want to more than double to horse power of a 70 hp 1.5 liter engine, and your working witha tight budget? that doesn't equate...
The only reasonable way to get HP like that is to toss a new engine in there. a D16Z/Y full swap, like stated before is $300-600 that gives you 125/126 hp
a B18B full swap out of a teg will yeild 140 hp, and is about 2000-2500
a B18C full swap out of a teg GSR puts out 170 hp and is 2500-4000+