Brackets are easy... 69-71 Big Block B/C/E body all the same...
Condenser, Steel line from Condenser to Dryer, Dryer, Dryer Mounting Bracket, line from Dryer to Expansion Valve & Expansion Valve Are all pretty 1970 Big Block or Small Block E body..... The two lines to the compressor are somewhat harder 70-71 Big Block E body or 71 Big Block B body....
You could easily fake the line from the compressor to the condenser with a small block line, the steel part is the same, the rubber hose is about 1" longer on a small block line.... Line from the evaporator to compressor is tougher, it's visually unique & kinda hard to find....
Good Luck!