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Messing around with your Z, you have to... ...or you'll loose something important.

The camera will give you a better idea for many parts of the car including the radiator support and front rails as well. Once you find an area that looks satisfactory Eastwood makes a product to coat those areas with an extension nozzle to reach deep inside.

Mike (Zspert) still has firewall insulation listed on his website for sale. https://www.zzxdatsun.com/catSoftTrim.php

Done and thanks! It was $23 today as a black Friday deal. It'll be here in a week. I concur with all that I still have a lot of work to do. I want to angle grind away the areas in front of the pedals and clear out what looks like surface rust. Sorry about the quality of the photos - I guess my phone isn't the best for taking photos in the garage.

Here's what I found on my 1970 doing as you suggested on my front rails. 20211208_144651.mp4.2bdf5fcff6bb33f08d7a9bb4b7ddccb9.mp4

Do yourself a big favor and get the Nidage Borescope from Amazon for less than $30 and look up inside the frame rails through the drain ports. You might be surprised by what you find. Also take a screw driver and tap along the bottom frame rail and see if you find soft spots. It’s a blue tooth setup that’s pretty cool. At least you can see what you have to work with.

Just a follow up to let you guys know I took your advice and bought the belts from Wesco. I did not buy the hardware kit but did buy the angle bracket, which was available separately. Not sure about other models but since my 73 interior belts mounted to the trans tunnel, the angle bracket was necessary for attaching the inside portion of the new belts. They worked out well and were easy to install. I had a few pieces of carpet left over from another job so used it to cover over the cavity where the old retractors resided. Held it in place with carpet tape. You can't even tell the cavity is there. Thanks again for the advice. Paul