This is a Polished Metric stainless steel Allen Bolt Kit TPI Unit on The Tuned Port Engines.
This kit fits the TPI manifolds for the 305 and 350 TPI small block engines.
The kit consists of packaged and labeled kits for the following components:
Fuel rail-Top plate-Throttle body-Idle Speed Motor Housing-Throttle bracket-TPI runner-Distributor Cover-Valve Covers
The stamps remain on the bolt heads, but it has been polished to a high shine. It's a low cost way to dress up your engine.