The 1988 318 Mopar is a well-made engine that provided solid and reliable performance when it was in its formative period. Like all older engines, if you want to restore a 1988 318 Mopar engine and give it the kind of power you want from a serious muscle car, you will have to break out the tools and do some work on it. The challenge is that because the 1988 318 Mopar engine did not find a niche in the aftermarket world, parts can be hard to come by. However, there are still workarounds so that you can boost the power and performance of your 1988 318 Mopar engine and get the feel for the surge of power that these great engines delivered when they were new.
Start out by taking a look at the cylinder heads. A good way to put some additional punch into the performance of your 1988 318 Mopar engine is to swap out the old 318 cylinder heads with parts from a 340 or 360 that were made in the same year. It is tough to find these kinds of cylinder heads on the aftermarket, but you can get lucky at salvage yards, finding some excellent parts to perform this upgrade to your 1988 318 Mopar engine.
If you perform a similar upgrade to the carburetor, the result will be that your 1988 318 Mopar engine will deliver a much better flow rate, which results in more power coming from the engine. Look for a carburetor that is rated at 500 cfm or better. However, set a cap on that rating at no greater than 600 cfm because the outcome can be less power which is counterproductive to your goals. You should be persistent in finding a replacement carburetor from the aftermarket because a rebuilt carburetor will not perform as well as a new one.
Performing similar maintenance on the exhaust headers is the last basic step to get more power from your 1988 318 Mopar engine. These three steps should be treated as a single project. If you replace the cylinder heads and the carburetor but you cannot finish the job and upgrade the exhaust headers, that can result in more trouble than it is worth. Do your research to locate the parts you need, either from junk yards or the aftermarket, so that when you start the project to punch up the power of your 1988 318 Mopar engine, you can finish it well and enjoy the outcome of a great 1988 318 Mopar engine that purrs like a kitten and delivers all the power you want in your restored muscle car.