I have a 1993 gmc 1500 with a tbi 350 that finally needs a timing chain after 211,000 miles. I just happen to have a cam from a 95 impala ss with all the lifters, spider, dog bones, etc with less than 20,000 miles on it. would i gain anything from swapping from a flat stocker to a roller? I know the cam for the impala was designed for moving a heavy car, but i've only heard very few things about swapping the cams. as far as the dist goes, i'll probably replace it at the same time.