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The factory used blobs of "dum dum" putty. I found some online and just rolled balls, flattened them and shoved them between the inner braces and the top sheet wherever it seemed necessary. Totally cured the hood shake and it isn't visible under the insulation pad.

Banking would be pretty gnarly, I imagine. Here's a shot of me coming down the hill to the kink in the back straight. Hard braking into Castrol Corner (manual factory disks with slotted cross-drilled rotors & ceramic pads... never faded)... In "parc fermeé"...

That looks like fun. Kind of a tight, technical course for the Barracuda. Back in 2012 I did a track day with my 67 fastback at Willow Springs in SoCal, a long, fast track (full 1/4 mile straight). Hit 110 before braking into Castrol Corner, and held 90 through the Sweeper. It was huge fun and...

Generally speaking, I would imagine that they are not insisting that the actual parts be 54 years old (that would hardly be safe, and would result in the gradual elimination of all competitors via attrition) — they just want them to be the same configuration and type.

Obviously, different setups (widths, compounds, treads, sidewalls) will provide different TRACTION. But you can't argue with the laws of physics. Contact Patch Area DOES NOT EQUAL Traction. That's all I'm going to say.

Contact area is a function of tire pressure and vehicle weight, period. The tire size is not a factor, in that the area of the contact patch will be the same for any tire size, given the same pressure and loading. On a tall, narrow tire the patch will be longer front to back, and on a shorter...

The Commando even with the factory cam was a revver. Not a lot of grunt down low (torque peak at 4K!), but it loves to wind. Look at this chart from the factory brochure. Don't be afraid to see how it likes it at 6K -- it's overbuilt as hell for the displacement.

Bumperettes might be too tight a radius -- the stuff doesn't like to stretch in two directions at once. Best on large, gently curved surfaces.

You can buy a new chrome steel bumper from AMD for $300. At least you can for a Barracuda -- I don't know about a Dart. But the wrap is a nice look if you want a fiberglass bumper for weight. I had a vinyl shop evaluate wrapping the interior A pillar trim, which on a 67 convertible is chrome...

Dorman makes almost every size of studs -- I went on their website and just looked through all the 7/16 options.

Bob Tullius won a Trans-Am race in 1966 in a Dodge Dart, with a little under-the-table factory help, and the car was generally competitive. But yes, they pulled the plug on factory support from 67-69, then came back in 1970 with Dan Gurney and Swede Savage. This team should have been a serious...

Sorry, a 67 Valiant is a sedan -- the windshield is different than the A-body hardtops (Dart GT, Barracuda) or convertibles. Did you try 67 Dart 4dr?

The value of the "speed of light" that everyone is kicking around is for the speed of light in a vacuum -- that is not the same thing as the speed of an electron in a metal wire. But the point is the same -- it's way too fast to worry about the differential lengths of spark plug wires.

There is one weight of Mobil1 Synthetic recommended for flat tappet engines: 15w50. It contains 1300ppm of zinc and of phosphorus. This is not cheap ($8.50/qt), but it might be easier to find at the local store than Joe Gibbs, or Brad Penn.