Quote:

the mp stage 6's have some fatal flaws, imho...


I don't think "fatal flaws" is the right term. The design has limitations as a result of MP's original goal to offer a replacement head that could leverage much of the existing valve train (valves, rocker arms, springs) available already for OEM heads. Given those limitations, they work pretty well.

Those small(er) ports result in high velocity and very good throttle response, even when using moderate compression ratios and fairly large cams for true street use.

If you want big(ger) ports while keeping the basic Stage VI design, you can go w/ Edelbrock Victors or Chapman's Stage VIs.