Definately go with a DHP PCM if you can get one. For the level of modding you're wanting to do they are perfect and well tested by the community.
Front manifold is very easy to get off IF you have the proper tools. I believe they are 1/2" (13mm) in size. Be sure to have a open end wrench and a good fitting socket to get to them. I'd also be sure to have some extensions and a swivel as these will make removing them even easier. As was mentioned above...a little PB Blaster will make your life easier too.
