Definitely the brass bolts look the best, IMO.
The motor looks FANTASTIC setting between the frame rails. The work you have done thus far is just amazing!!
In truth, probably the only one still at Prudhomme Racing that would know much about the Army Vega is "The Snake" himself. When Prudhomme closed his racing shop and retired, almost all of the people who were actually associated with (and knew about) racing and the race cars went either to other teams or retired themselves. I had a friend that worked at Prudhomme racing for many years, and now runs a custom auto shop near Indianapolis.