The preposition long is used for nominal conjunction only, while and is used for nominal and verbal conjunction. Juxtaposition may also be used for both types.
Source: Tong 1862: IV.69
Source: Holman 1834: 110
Source: Tilden 1831-32: 767
Source: Tong 1862: VI.29
Source: Tong 1862: VI.34
Source: Tong 1862: IV.32