b&m blackjack is a pretty marginal +EV play nowadays, especially compared to the opportunities in poker. not to say that people can't make money doing it, but on an hourly basis and the variance of finding and exploiting good conditions, it's a tossup at best.
$340K sounds like an extremely inflated number (especially for just one week) which owes a lot more to luck than actual skill. without knowing the average bet size used to achieve this profit, or the number of hours played, any random dollar amounts quoted are virtually useless in determining what actually happened in terms of long-term mathematical soundness of strategy.
outside of card counting, you can make a decent amount of auxiliary profit working off deposit bonuses at online casinos which allow blackjack for clearing. the 0.5% house edge is small enough that you will theoretically have an ample amount of most bonuses still left over when you're done with the wagering requirement for withdrawal.
the 2+2 books on blackjack should be informative and have sound strategy, but I don't believe Sklansky and Malmuth are considered the leading authors in this particular game. you won't need to buy a book to learn basic BJ strategy - this is available for free online on many reputable sites (
www.blackjackinfo.com would be my personal recommendation). when and if you decide that you want to try AP tactics, this archive thread might be useful to you:
http://forumserver.twoplustwo.com/sh...Number=2482687