Probably not a good reason to spend a lot of money on the existing heads if you are planning on relplacing them.... Just a suggestion, why not just leave the engine you have as is, then start accumlating parts as your budget allows and build a complete new engine. You can keep driving your car as it is, then when you have all the pieces for your new one you can put it together and install it in your car and everything is fresh at the same time.....It will save you a bunch of money in the long run...