if you want 140hp out of the motor all you have to do is upgrade the cams to 94+ integra cams, buy some used off of someone on here or off of ebay, thats the only difference between the two engines the different cams
and don't pay more then 30 bucks for the set of cams they're a dime a dozen, hell more like a nickle a dozen, you could probably even pull some from a junk yard for pretty cheap and in good condition