Because of the high quality of restoration you are doing to your truck, Craig, I highly recommend DOT 5 Silicone. If you use regular Dot 3 or 4, you will put all of your paint restoration work at risk. Dot 3 or 4 will destroy your paint work no matter how careful you try to be. Dot 5 Silicone will not phase your paint work and be your best choice for all the other reasons. The only thing about Dot 5 that I have found to be a problem is leakage. It is so thin and slick that if your are going to have a leak in your system, it will show up with Dot 5 Silicone. Since you are totally rebuilding your system, that may not be a problem for you. I would take that chance.
As far as bleeding the air pockets out of it - yes, it does take longer to do that, but you can get them out. Patcience is the key! I know you have patience by what I see you are doing to your truck!
I have had it in my 37 since 1980 and have enjoyed all of the positive aspects of Dot 5 Silicone.
One last comment - it is expensive with a quart going for about $30.00.
