either way will work.. I went with the Heidts IFS complete front end with the big camaro brakes... works very well, except it sits too low for MY liking.
I hired a certified welder to install mine, after I did all the measuring (5 or 6 times)... he measured it a couple times, and we banged it out in about 6 hours...
MAKE SURE YOU MARK the centerline of your front wheels before you tear anything apart, or you will be hating life.