looking to rebuild my 340

there are better heads, but ordering a set could take 10 months or more. be careful

(read through this thread)
http://board.moparts.org/ubbthreads/showflat.php?Cat=0&Number=7555161&page=0&fpart=1&vc=1

you could stick with eddy heads, get a better cam (like rob said) and pick an intake to match your cam as far as rpm ranges