Completed my VE table, and now working on spark.

Question...how do I calculate the spark? I don't understand how I have 90 degrees spark retard. I don't think the engine would survive retarding 90 degrees. Please see below LS1-edit scan.

MAP in Kpa RPM Speed KPH Spark Advance Air Temp C MAF in Gms/Sec TPS in % O2 B1 S1 O2 B2 S1 Fuel Trim Cell Knock Retard
87 4207 104 21.5 19 161.16 47 975 1025 15 90
89 4270 106 21.5 19 167.76 50 995 1035 15 88
90 4338 108 22 19 182 53 1030 1045 15 84
90 4431 110 21.5 19 181.32 55 1025 1050 15 82
91 4600 112 20.5 19 197.76 57 1025 1055 15 80
92 4682 116 19.5 19 188.84 59 1020 1045 15 78
92 4768 118 19 19 191.68 59 1035 1055 15 76
92 4932 121 19 19 194.24 59 1030 1060 15 73
81 4953 122 20.5 19 104.42 45 1035 1070 15 71
12 4852 120 33.5 19 8.9 18 1065 1100 3 70
95 1914 81 20 20 64.6 39 910 715 14 43
64 1930 81 26.5 20 33.9 33 900 165 14 43
98 2523 62 24 23 89.4 48 690 140 15 33
79 4136 101 26.5 19 147.62 43 305 805 15 32
97 2590 64 24.5 22 89.16 48 810 680 15 31
79 2649 65 24 22 61.84 43 835 120 15 31
60 2689 66 28.5 22 45.52 26 965 1000 11 30
57 2736 67 29 22 52.52 26 885 710 11 29
57 2748 68 29 22 52.6 27 315 810 11 28
55 2778 69 31.5 22 49.5 27 895 940 11 27
51 2810 69 36 22 46.04 25 900 930 7 26
90 1482 92 18 18 44.82 31 810 815 14 20
91 1491 93 17.5 18 46.28 31 805 865 14 19
90 1498 93 18.5 18 28.68 29 825 940 14 18
52 1497 93 23 18 9.96 12 930 1000 10 17
80 1767 75 26.5 20 49.64 29 860 670 14 16
100 2388 101 24.5 19 90.36 60 1000 1020 22 15
84 1812 76 25.5 20 56.46 31 735 105 14 15
88 1831 76 24.5 20 59.5 33 180 845 14 15
91 2406 102 26 19 84.88 30 920 910 22 14
92 1851 77 23 20 62 36 860 575 14 14
95 1872 79 22.5 20 62.68 38 905 895 14 14
96 1898 80 20 20 65.42 38 920 915 14 14
99 1934 68 22.5 19 70.02 49 430 700 14 11
82 1378 86 23.5 24 36.24 26 730 430 13 11
62 1383 86 27.5 24 19.88 14 955 990 9 11
99 2022 71 23 19 71.44 49 830 780 22 10
99 2060 72 23.5 19 76.24 49 815 160 22 10
99 2097 74 23.5 19 73.56 49 850 785 22 10
99 2140 75 24 19 74.92 49 625 200 22 9
84 1330 83 22.5 24 35.88 26 785 560 13 9
84 1337 83 22.5 24 36.6 26 735 200 13 9
84 1349 83 22.5 24 36 26 690 730 13 9
98 2167 77 24 19 74.2 49 745 760 22 8
98 2206 78 24.5 19 78.76 49 855 785 22 8
98 2286 79 25 19 84.82 49 795 180 22 8
84 1355 84 22.5 24 36.46 26 830 295 13 8
84 1358 84 23 24 36.88 26 790 755 13 8
98 2324 81 25 19 79.6 49 205 160 22 7
98 2355 83 25.5 19 81.46 49 550 825 22 7
84 1368 85 23.5 24 36.44 26 730 875 13 7
84 1375 85 23.5 24 36.6 26 770 105 13 7
98 2382 84 26 19 82.32 49 790 815 22 6
98 2418 86 26 19 84.24 49 840 550 22 6
97 2457 87 26.5 19 85.36 49 880 895 22 6
97 2496 88 26.5 19 88.08 47 885 295 22 5
92 2532 90 27 19 88.08 38 830 815 22 4
59 2578 91 33.5 19 50.32 29 890 895 11 4
95 2408 101 26.5 19 84.88 44 730 720 15 1