Chevrolet 305 High Flo T P I Pdf - droitsdelhomme-france chevrolet 305 / 350 c.i.d. t.p.i. v8 (1985 and later) installation instructions. MANIFOLD: High-Flo T.P.I. Baseplate #3860 is designed to be used with . either aluminum or cast iron cylinder heads with center bolt valve covers (all OEM applications, except Vortec). 1985 Chevrolet 305 High-Flo T.P.I. Runners Installation Download 1985 Chevrolet 305 High-Flo T.P.I. Runners Installation Manual – INSTALLATION PROCEDURE 1. Disconnect battery negative cable. 2. Disconnect throttle body from Mass Air Flow Sensor boot and disconnect all lines from throttle body (linkage, water, vacuum, etc.).