You need 42% equity (call 5.99 to win 8.29).

1,232 games 0.001 secs 1,232,000 games/sec

Board: Ad 8c 7h 7d
Dead:

equity win tie pots won pots tied
Hand 0: 57.914% 53.00% 04.91% 653 60.50 { Js7c }
Hand 1: 42.086% 37.18% 04.91% 458 60.50 { 88, A8s-A7s, Td9d, 87s, 75s+, 6d5d, A8o-A7o, 87o, 75o+ }

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If you think that range is about accurate than call- but it's a good thread because I normally fold in a spot like that- I was a little surprised at our equity against that range.