It’s a prestolite distributor for a B engine and being points it’s for a pre 1970 383
Not for a '67 383 unless from maybe a A body.My guess its either 1967 or 1968 vintage "B" block because of the arrangement of the vacuum advance mechanism...to change the RATE of advice, the nipple end un-screws to add or remove shims under the spring to adjust its tension. Later models use a crimped housing and adjusted spting tension thru the hose nipple with an Allen wrench. Just my opinion of course
BOB RENTON