yeah i also get a discount on them, which is why i went with them being the mopar catalog claims they flow 265 out of the box, and with MILD porting they hit 300. I'll be the first to call BS on those numbers, problem being they flow them on a 4.125 bore...not a 4.030 or 4.040 like the average joe. mine very well might floe 325 on a 4.125, but they sure aren't going to do it at 4.030 with 28 inches of water.
long story short if you're using anything other than an R block with a huge bore, be ready to spend another 6-800 dollars to have the valves unshrouded and the ports/runners cleaned up. and as with any set of aftermarket heads, the springs are useless unless using a .480 hydraulic so you'll need those...and oh yeah...no one make an off the shelf rocker for them. call harland sharp and ask for randy jr, he can set you up with my rocker setup, IF you go to a pinch smaller spring.
These heads are not exactly a bolt on and go operation!