Peak HP from LA block w/ no problems

OK, so I can assume its safe to say I will have no conceans using a "factory LA block" -1970 340- to build a mild, streetable stroker.. Im not looking to persue a raging 10 sec. 565 HP engine build by any means, but I thought what I read in this article that 430-450 was a "maximum allowable" figure and personally I thought was a tad conservative.