Swirl ports are fine to use but you have to remember a few things. It`ll give it excellant pulling power to about 3500 RPM, around 4000 RPM it falls flat on it`s face. Second thing to remember you`ll need a intake that has the 4 center bolt holes at a different angle. You can drill it out yourself but it won`t look very good there after. The swirl ports also have a 64 - 66cc chamber which will up the compression ratio compared to 76cc smog heads.
Since you`ll be using your truck as a puller then the swirl port heads will work fine.