What bore do you plan on using? I'd just like to point out they published these in the mopar book with flow number from a 4.125 bore, thats cheating. A stock 318 head would flow well on that bore... its very misleading. AS CAST these flowed a MAX of 269 CFM on the intake side, and that was only at 500 lift (4.030). Without some serious porting and valve unshrouding, they are not optimal. If you have a big bore block laying around, then disregard my comments.
AFTER PORTING (by TEA, a respected head porter owned by TFS, Owned by Summit), they BARELY flowed 290 CFM on a 4.030 bore. Am i bitching about my 600 horse smallblock...no not at all. Do i hate these heads? no, not at all.... But do i fully believe i lit about $1000 on fire by buying these over the edelbrocks that were avail..yes...100% yes. They were more than the edelbrocks, required the exact same amount of work as the edelbrocks, and furthermore, required custom rockers at additional $XX. Just trying to save anyone else from the money i wasted 5+ years ago.