Is it a 6 bolt or 8 bolt guibo? the 6 bolt one have almost no change in the diameter when spun at high speed. the 8 bolt one do grow a bit at high rpm, not that this directly affects the bent shift rod but you may be able to get by with the 6 bolt a bit easier.
Also check the 3 duck bill drains in the heater plenum they can get stuck open when they don't clear the junk all the way out (pine needles) or they could be missing completely.
Is your cam a regrind? these are often fitted with valve stem caps which can wear in the center so that when you slip your feeler gauge in it bridges the gap and it will read a prefect .007 inch but with out the gauge blade in there the eccentric falls into the hole leaving a noisy valve.
As Toby said buy a used name brand welder that you can get parts for if needed. When shopping on c-list or fb have cash in hand and gas in the car because they go fast, there are also places like tool king that sell name brand welders that have been used in schools for a year and then sold.
I'd stock pile a new cam and rockers, the black spots in the enlarged photo are the back side of the hardening and at some point it will wear through and the lobe will go flat shortly there after. Only run a high zinc motor oil and never run the same rockers on the new cam they will have bits of the hardening stuck on the faces and ruin your new cam.
They were when they were made in Germany, but the off shore ones at least from Bosch have gone from good to beyond bad these days, which is a shame.
PS. I'm not saying the VW link above is in anyway diminished by Bosch's crap.
I don't like the hard rev limiters I mean if your running 6600 rpm do you turn your key on and off because that's how these rev limiters work. If you need a rev limiter your much better off IMO with a soft limiter that just shorts one plug at a time like the msd box.
You might try taking a sharpie and marking the flywheel and ring gear with a line then replace the starter and crank it then remove the starter and see if the marks line up to eliminate the possibility that the ring gear is tight enough around the flywheel.
Realoem doesn't recognize that part number.
t/o bearing for a 228mm clutch is 2152 1204 224 and it measures 47.5 mm tall.
t/o bearing for a 215mm clutch is 2151 0670 070 and it measures 42.5 mm tall
Try pumping the clutch a bit and see if more travel is gained if so you have air in the system the slave is known to be a bit hard to get bleed properly, if things stay the same it's possible that the 215mm clutch t/o bearing was used.