Please explain I would like to know.
All I can think that idle would be sh!te, may have to set it at 1500rpm. And that it would be starved of air above 7000rpm.
I know enough but would like more info.
You get pulsing issues in the plenum with cams over approx 260 degree duration, which sends the MAP sensor crazy and caused major running issues below 3000 RPM especially in closed loop lambda mode.
You can't set the idle at 3000+...it will fail the MOT.
In fact, it will probably fail the MOT anyway with cams much over 260 degree duration and high lift.
Cam lobe clearance is not usually a problem on hydraulic cams, go solid lifters and 13mm+ cams and you need to clearance the head...but you can run 276 degree/12mm lift cams without clearance issues...but it still won't run on a plenum.
You may get it to run on standalone management with no MAP sensor, mapped Alpha-n.
Best way, stick to cams no larger than 260s, go mix and match on the cams, or go 268 or 276 on ITBs with standalone management.
Don't find out the hard (expensive) way...like I did.