I have used the Fel-pro 1008 on my last 3 motors with no problems...and one of them was sprayed with a 150-180 shot of nitrous every pass down the 1/4 for 7 years.
You got 7 years out of a sprayed motor? I am gonna be re-doing my valve guides and seals after one season, but then again I have a 7000 pill and LOVE doing burnouts at full throttle. Might have to reconsider that since it looks like over $500 for the job.