This is a really clean used Mercruiser Thunderbolt IV V8 Chevrolet distributor with pickup coil and V8-24 ignition module mounted to distributor. 
Fits 305 350 454 502 engines. Lower bushing still really good, not worn out like most of them.

 We are Martin Engine Machine, located in Webster, NY. We are a complete Hi Performance engine machine shop and have been in the engine building business for over 35 years.