You get alot with a turbo setup. It does put a strain on a stock setup. You can easily start lifting heads with stock headbolts. I think ARP studs plus 9333pt1 felpros combined with a good tune and you are good to go. But as you mess with turbo or forced induction stuff, you need to be open to the idea of replacing headgaskets/pistons/etc. Comes with the territory. Your motor will be doubling its intended hp and torque. You don't get aught for naught.
As far as plugs go-I would think it depends alot on the turbo setup. On my homebuilt one with P heads, it is not that bad on the passengerside-so long as you replace them from under the car. No way could you do it from the top.
The real pain is replacing headgaskets when you have to take all the turbo stuff off in addition to everything else.
97 Laser Red GT-248A Wingless model, Built Lincoln Mark VIII motor-Procharger D1SC, 3 core IC
2012 Black GT-Saddle, 3.73s, Brembos, Shaker1000