The best source on the strength of the ANV in the Battle of the Wilderness can be found in Alfred Young III, Lee's Army During the Overland Campaign: A Numerical Study (2013).
The following is taken from Table 16 – Infantry Strength of the First Corps at Selected Points during the Campaign – May 5; Table 17 – Infantry Strength of the Second Corps at Selected Points during the Campaign – May 5; Table 18 – Infantry Strength of the First Corps at Selected Points during the Campaign – May 5. Note that the the strengths are those "present for duty", "effective strength" would be approximately 94% of the numbers "present for duty".
First Corps
Kershaw's Division
Kershaw's Brigade – 1590
Humphreys' Brigade – 940
Wofford's Brigade – 1615
Bryan's Brigade -1025
Field's Division
Gregg's Brigade – 850
Jenkins' Brigade – 1590
Anderson's Brigade – 1390
Benning's Brigade – 995
Law's Brigade – 1255
Second Corps
Johnson's Division
Walker's (Stonewall) Brigade – 1320
Jones' Brigade – 1850
Steuart's Brigade – 1610
Stafford's Brigade – 705
Early's Division
Hays' Brigade – 900
Gordon's Brigade – 2270
Pegram's Brigade – 1520
Rodes' Division
Ramseur's Brigade – 1440
Daniel's Brigade – 1500
Doles' Brigade – 1365
Battle's Brigade – 1810
Johnston's Brigade – 1320
Third Corps
Heth's Division
Cooke's Brigade – 1960
Kirkland's Brigade – 2150
Davis' Brigade – 1690
Walker's / Fry's Brigade – 1650
Wilcox's Division
Lane's Brigade – 2350
McGowan's Brigade – 2230
Scales' Brigade – 1735
Thomas' Brigade – 1600
Anderson's Division
Perrin's Brigade – 1635
Mahone's Brigade – 1805
Harris' Brigade – 1395
Wright's Brigade – 1685
Perry's Brigade – 610