how many rpm will it take
 

ok its brand new with j&e forged flat tops stock rods and crank all balanced arp rod bolts, 1-7 roller rockers so how high will this baby wind up safely? and this motor will make 340 at the crank, how much can the stock parts take?

Stock bottom end + high rpm's is not good. If you are expected to make 340 at the crank, it can make that kind of power and never have to see over 6000rpm if you picked the right combo. What is your cam specs... what intake and heads do you have? Need more info.

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347 W/ A-trim 6#'s, Canfield heads, out of the box Systemax II intake, solid roller cam. 11.1 @123mph

93lx 5.0 daily driver