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I figured out that it was roughly a coin flip, with him being a slight favorite. But pot odds did not justify it, and I dont think even playing the player in the case was worth it. I could have waited for a better spot to put him in his place and make him think twice about coming over the top on me. I definitely didn't consider A high to be good. I knew he was solid enough to at least have a K. Thanks for the responses.
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You logic is ugly here. You figure out this:
http://twodimes.net/h/?z=1428459
pokenum -h as jd - kh 9h -- ks 7s 4s
Holdem Hi: 990 enumerated boards containing Ks 7s 4s
cards win %win lose %lose tie %tie EV
As Jd 456 46.06 534 53.94 0 0.00 0.461
Kh 9h 534 53.94 456 46.06 0 0.00 0.539
That is, that it is a coin flip with your opponent a slight favorite. So you need very little in the pot to justify this call. You had more than enough. Besides, this maniac could've had far less than kings. The other three jacks may have been good if he had middle or bottom pair, or you may have been leading if he had a hand like Qs Jd or something. I call in your spot with that hand against an aggressive player much more often than not.