i'm running them on my 68 dart ss clone. i bought them several yrs ago (2004 i think) and because of the motor being in an a body i felt i needed them incase i ever have rocker issues. i bought the stands only and paid $900.00 iirc. pros are pulling the rocker shafts without taking the head bolts loose and better geometry. cons are custom pushrod lenghts, possilbe pushrod clearencing in the heads and rockers hitting the valvecovers. these issues are due to the fact that the stands are relocated up and out for the improved geometry. very nice pieces and dan can be very helpful. dave