Result
http://twodimes.net/h/?z=2051197
pokenum -h 8s 8h - ad 2d - kd td -- 8d 6d 4d
Holdem Hi: 903 enumerated boards containing 8d 6d 4d
cards win %win lose %lose tie %tie EV
8s 8h 321 35.55 581 64.34 1 0.11 0.356
Ad 2d 580 64.23 322 35.66 1 0.11 0.643
Kd Td 1 0.11 901 99.78 1 0.11 0.001
This is a genuine triple up situation for you so even if there was no oney already in the pot, you knew what they had and they pushed all in on the flop its +EV chip-wise to call it. .
That said I think I prefer the flat call - if you miss and they push you can get out relatively cheaply and if you hit you are tripling up at zero risk