Check out my car and talk to me about 318/340 swap

Do you know the compression ratio of the 318? I had a teener with 340 x heads and it ran out of steam at 100 mph. Just not enough compression to push the car faster. Make sure you are getting the most out of your 318. Building a 340 can be pricey. If I was to build a more powerful engine, I would build a 400 big block, more power and not all that much more money.