[Silver-911]

Thanks for all the assistance so far guys. I know it was kind of a long winded post. I will try to consolidate the info a little better next time.

The engine number is 930/07, we were led to believe from the previous owner of the car (my father purchased the car in 2006, he passed away last year and left the car to me), so I can't confirm this, but I believe the car has 964 cams and the engine was recently rebuilt. No idea what other internal modifications were done, but when the Porsche specialist was working on it last year he did comment that it appeared to be put together well as he noticed a few things he regularly does when doing a rebuild, so someone knew what they were doing.

The main issue is a hesitation/miss/lack of power at higher RPM with mid/high throttle input which smooths out a bit under WOT or low throttle input. It feels like the timing is off under these conditions or the engine is starved for fuel or too rich. Just kind of falls flat on it's face and bogs down.

The distributor has two vacuum lines on it.

Hopefully my fuel pressure test kit will arrive this week. I also should have the wideband O2 up and running by the end of the week to double check if it's running lean or rich.