Its not offset, but any rotation of the stock part would only pull the threads in tighter. I get what you are saying though, I just don't think it will an issue. This part is solidly bolted into the head and at worst will only be a few mm off center. A quick plug in of some numbers into a bolt calculator buts the axial clamp force of its bolt well into the 10's of K- Newtons.
Speaking of, I finished the part this evening. It is made of cast iron, harvested from an old 617 camshaft. The part was turned to all critical dimensions except the finished diameter. It was then flame hardened and finish ground to the final diameter, followed by 3 stages of polishing. Turned out pretty well, pun intended 
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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start
90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff
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