The easiest way to describe an engine to a novice is that it is an air pump. The more air you pump, the more horsepower you make. If your original engine had a silly little plastic airbox, then you replace it with individual throttle bodies. If you original engine had a exhaust manifold with a Lincoln Log logo on the side, then replace it with headers. Just keep increasing the amount of air you engine can flow and eventually it will be as wicked as this next thing. Find this 1982 Toyota Corolla SR5 Liftback offered for $7,500 in San Mateo, CA via craigslist.
From the seller:
1982 Toyota Corolla SR5
cylinders: 4 cylinders
paint color: white
title status: salvage
1982 Toyota Corolla SR5 Liftback 3TC engine 5 speed manual transmission, twinside Weber, headers, Momo steering wheel, nice interior, foha rear spoiler, Enkei w/50 series tires, original paint with rear tail light area surface rust, minor dent accident on right side. Serious buyer only. Pls. leave ur name & cell number. $7,500. firm
See a better set of wheels on a vintage Corolla? firstname.lastname@example.org