Parts information breakdown
1) The Carburetor to a BOSS 351 is one of the most "priciest" pieces of all muscle car parts. It is because it is extremely rare. This Autolite 4300D series which has a spreadbore design, small primaries and oversized secondaries fetches upwards to $2500-$4000.00 in restored shape. It was not highly respected with factory settings (though it was no slouch) on the street or strip and was replaced, in most cases, by Holley's. The intake manifold was usually replaced as well.
Note: Articles of the day (running engine tests) stated that if you replaced the carburetor and intake with a Holley 750 double pumper and a Edelbrock "Torker" intake manifold, it would produce an additional 70 horsepower over the stock number of 330bhp. Headers usually added another 10-15hp. So it is easy to see that this car with very few changes could easily produce over 400 horsepower.
1972 Holley Catalog: Original Equipment (O.E.) replacement for Autolite 4300-D spread bore. 1971 BOSS 351, manual trans. Carb. 0-6129, Ford No. D1ZF-9510-VA, manual choke, 780 cfm, model 4150.
2) Heat Shields were also usually removed and forgotten when owners added headers.
Different examples of Boss 351 interiors:
(Standard / Mach 1 Sports Interior / Deluxe)
Click on examples below.
Boss 351 interior "visual" features: