Why not. Spacers do not change the ride.
There is no definite temperature that plywood would combust at. Since plywood contains various chemicals, it will depend on what type those are, its size, etc.
The headers would be the same anyway, so you can order headers for the 83 and be all set.
Plywood. It has more trapped air.
Yes , you would have to unbolt the headers from the cylinder heads
I would buy some new plywood You will be able to bad plywood thru the shingles... especially 20 year shingles.
Find a wrecked z-28 or ss and take the ls1/lt1 out of it. The t56 six speed transmission would be a nice addition as well. You would be adding a hundred horses for around $1500 not a bad idea.
The answer will depend on the size of the plywood sheet!
I would say yes because it hurts for me to even chew my spacers.
no.
In some instances, the plywood could have been the finished wall at one point in time. Future owners may have gone over the plywood with drywall.
Yes they should work but why use them? With the Fabtech kit in place, the truck is already lifted quite a lot. If you install coil spacers, the coils will be stiffer and driving characteristics will change especially when doing turns. I would try driving a truck with coil spacers before having them installed and see if I like it or not. Yes the ride is a little stiffer but its definitely worth it to clear a bigger tire