Noted that firewall insulation and drain hoses are missing--maybe yet to be installed.
Question--with headers of the type installed--can there be heat baffles in place to minimize the extreme heat soak generated around wiring and within the engine compartment? If not perhaps a ceramic coating would help.
BTW--concern of rust being covered up by dynamat is groundless as I can assure you that CoupeKing and his team are fastidious in dealing with even minor rust issues.
What I'm hearing is back East folks who have rust everywhere assume it is also prevalent here in SoCal. Having survived the rust belt of Northern Missouri until graduating from University, Navy at sea for nearly 4 years, Detroit for 11years and New Jersey for 3 more I am intimately familiar with rust and corrosion. It simply doesn't grow here like you assume. I also speak with nearly 40 years of E-9 care and preservation.