Nitrous plumbing A1A...??..

1991, going for a 9 sec run in the '69 car which was my final goal. Big Shot kit, 175hp jets....4800stall, 4.88's 32" tyre.
Hit it off the line as always...rpm went straight to 7000rpm...just managed to catch it going past 7400, hit 2nd...s^it the life out of me.
Went through the traps @7500+, not good with 6pk rods/pistons, motor was singing a very unusual song.
All ok but never did that again...ran 9.96...last ever run.
N20 is good but don't get carried away too quick, been running it for 3yrs and thought I was used to it, not so.
take care.:)