AC Delco GM 1104060 Marine Distributor V8 EST Module Sierra 18-5484-1 350 454 Pulley - Crankshaft but they do look like

but they do look like they were replaced at some point as usually the stock cap was black on these

135hp 1350

Mercury 78277A1 Exhaust Manifold Cover Stamped 78276

1966 1967 1968 1969

Base Plate: 305303

AC Delco GM 1104060 Marine Distributor V8 EST Module Sierra 18-5484-1 350 454 Pulley - Crankshaft but they do look likePart Number(s) Included Stamped 1104060 which is an AC Delco GM Part number J1171 (Marine Grade Rated) General Application Compatibility GM V8 305 350 454 502 using a common EST style ignition module I don't know a ton about this beyond what is stamped on it, but looks like a standard marine GM V8 distributor using the common EST Module and allegedly replaced the following: Crusader PCM Pleasurecraft Marine RA107039D Indmar 556024 OMC 3857400 Volvo