I'm in the process of building a true cowl induction hood for my 71 Monte merging a Chevelle SS hood and the framework with a Monte hood and framework. That's how I determined what the material was. I'll post some pics of the process. I wanted what the factory failed to offer.
This is the same stuff used between the hood skin and the hood frame. I use Fusor 121 or Fusor 231 for that. Its a flexible foam sound dampening material that allows the panels to expand and contract without causing panel ripples.
I run an 87 Corvette serpentine belt system using an R4 compressor with custom lines. Had them made by http://www.rayeveritt.com/ Quick turnaround. Pictures of my install can be found on my page.
https://picasaweb.google.com/109896750363574700634/1971MonteCarloRed#5175410954274146082
Send me a PM with your email and I send you a pdf of the factory dash removal instructions I have. It's a 1970 printing but the instructions are the same regardless of the 3 years.
Depends on the rear axle ratio and whether overall tire diameter has changed from factory tire height.
Take a look at this chart to give you an idea.
http://www.teufert.net/speedo/69-gtogp-400.htm
I paid $70 each for the rebuilt since I sent 4 at the same time. Regular price at the time ( a year ago) was $85. The place was recommended by my uncle who has hi-end shop in Florida. Haven't had the opportunity to install them yet.
Why not just have them rebuilt? I used
South Florida Window Lift
445 NW 1st Avenue
Ft. Lauderdale, FL 33301
http://www.windowmotor.com/
and had all 4 turned around in a little over a week.
Phil,
Give me a call after lunch Saturday and we can put the car up on my lift so you can actually look at what's installed without laying on the ground.
Absolutely nothing. On a business trip in boulder co having a beer right now. Off to san jose ca tomorrow. Maybe I can get some work done on my monte when I get back.