$7000? For a Blowthru? You're having custom headers built anyways aren't you?
Consider how much a teardown and rebuild may be worth to you when you oxidize a hole right through a piston?
Chris Tuten (NMRA Drag Radial 2005 Champ) went through
80 pistons in a season on his N20 motor running mid 8's. His turbo motor ran 8.30's all season in 2005...right up to the championship.
Just putting it in perspective man.
Keep us informed on the build.