Well, Based on what I see I would:
Pick Up Riggs Stephenson for LF you need the OBP and he is better and more balanced than Cleon
Pick Up Geronimo and Walker for a L/R platoon
pitching
For the infield I would go with White/Lansford platoon at 1B or else keep Cepada. If you don't go with White/Lansford then you'd need Charlie Keller in LF to give you a top of the order Lefty bat. Lansford has over .500OBP versus lefties. If you use him marked avoid righties defensive substitution White that can be very effective
2B Evers/ Defensive BU Gallego as late inning replacement. I have tried a lot to use Doyle because of his bat and speed but it never works out too well because of his weakness against lefties and 80 million is too weak to platoon. (In a 100 million league you can use Doran/Doyle effectively)
Chapman at SS - he is vastly better than Peck
3B I would pick up Mathews
C Dempsey or Gibson if you'd like a little more offense
You need lefty pitchers Garcia must go Mantle and Brett will beat you sensless. Need lefty pitching for them. Myself I would cut Camintz and Garcia and pick up Russo, and Lanier(if my choice was more hitting I'd use Hiller) and then use the money saved to either upgrade to the hitting choices or move to pick up a lefty reliever/starter type to put in the bullpen. Other middle value pitchers are Norwood Gibson, Pat Dobson (for Griffith type parks only, Curt Simmons and Doc Crandall.) I kinda like a Cicotte,McClain/Dobson for the teams I need righty and a Russo/Hiller/Simmons as my pitchers for lefties and set the per game starters. Russo or Hiller can swing in for Dobson in bomber parks. I think it is imperative you render Brett and Mantle impotent and with lefty pitchers their value is around 6.5 million for Mantle and 4.5 million for Brett. Combined with Geronimo's and Meusel arms you take thier power away and turn them to station to station hitters. If you'd like to go more this way I'd look at it in more depth but this allows you to arrange your pitching to your oppenent so the felxibility makes up for the wasted $'s
I haven't actually priced this out but I would start moving toward that type of team, this would give you one type of the order lefty hitter (keller or Lansford) Good Even lefty power hitter, a platoon pwer hitter with speed (white, who will do very well at the bomber park in your division, good defense arms in CF and RF.