I'm thinking of doing the 3.54 rear with the 0.64 5th because cruising in FL means 80-90mph. Yet again I might be moving back to the NE, where cruising means 70mph, in the next 2-3 years. I've been considering the 0.82, and if I go with it then the question is whether to go with a the 3.54 or the 3.31 rear. Gear ratios are here:
http://www.erareplicas.com/427man/tr...ring/index.htm
For the seat heaters, my wife enthusiastically votes yes we should have them. Even for 50 degree weather. So that might swing the vote.
Regarding the noise suppression, it isn't for actual sound, but more the vibration sense of the car. I like being able to knock on an aluminum panel and have it sound dead. Then again, is may be not be worth it for that either. What I'd really like to see is if the Firewall helps with cabin temperature.