Tigers Boast fLean, ToughMound StaffBy WATSON SPOELSTRA IDETROIT, .Mich. «Charlie Dressen has rebuilt the Detroit pitching staff almost completely in less than three years and the results are quite impressive.The Tigers lowered their staff ERA to 3.35 last season. Research discloses that this figure is unmatched in Detroit since Hal New-houser, Dizzy Trout, Fred Hutchinson and Virgil Trucks were dominant figures in 1946.“We’ll be even better next summer,” promised Dressen as he prepared for the start of early camp on February 15 at Lakeland, Fla. .The severity of Dresden’s priming was made clear when Bob Scheffing quit as a Detroit scout to become cdirector of player development for *the Mets.Scheffing turned over manage- ^ ment of the Tigers to Dressen on jJune 18, 1963, and a curiosity seeker wondered how many pitchers remained from the Scheffing adminis- 'tration.The answer is three — Hank 1 Aguirre, Mickey Lolich and Terry Fox.Both Aguirre and Lolich are prominent in Dressen’s spring plans, but Fox has become expendable in the continuing campaign for a stronger bull pen.Top-Ranking QuartetDenny McLain, Joe Sparma, Dave Wickersham and Bill Monbouquette are the principal new men in Dressen’s revamping job.McLain’s slick 16-6 performance last season took on new luster with