Does an 89 TBI truck motor use self-aligning rocker arms? I know my motor still has the old style intake manifold bolt setup. I've been looking into some 1.6 roller rockers and wonder if I need the self-aligning or not. Also, what would be better? The Holley TBI or the Edelbrock MPFI system that uses the stock TBI? Which one is more reliable or should I stick to the original GM TBI? Thanks for any help.