Was thinking of using a 90mm (actually 88mm) throttle body off a newer 6.0 & 6.2 truck engine with the 4 bolt pattern but my stock intake is for the 3 bolt throttle body. Does GM make a 4 bolt intake that will work with the regular cathederal port heads on the 5.3L? If I had a 6.0, I'd use the L92 heads and intake swap but don't want to go that route just yet. I've gotten 375+ hp so far out of my 5.3 with a small cam, headers and slight mods but am looking for more. My truck is a 2006 model. Any help in this matter would be appreciated.