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At best you're a 2-1 underdog.
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http://twodimes.net/h/?z=966429
pokenum -h 8s 3s - - kd kc -- 2h 4s 5s
Holdem Hi: 990 enumerated boards containing 5s 4s 2h
cards win %win lose %lose tie %tie EV
8s 3s 539 54.44 433 43.74 18 1.82 0.554
Kc Kd 433 43.74 539 54.44 18 1.82 0.446
to the OP, its a hell of alot better to be the one pushing with an open ended straight/flush draw than to be the one calling the push. best case scenario your looking at a coinflip here, which isnt usually what you want to be calling all ins with in a cash game.
and ... fold preflop, playing any 2 suited in any position to a raise is no good