It does not require a threaded hole in the head - Designed to use with "Fuelie Heads". This aligns the drive (crank) pulley with the water pump pulley. Then this is the kit you need to finish off your installation.
SB Chevy 69-86 Alternator Chrome Bracket Kit Long Water Pump 265 283 327 350 SBC
Small Block Chevy Alternator Bracket Long Water Pump 283 302 305 327 350 SBC ALT
Small Block Chevy Alternator Bracket Electric Water Pump SBC 283 327 350 400 EWP
Chevy Electric Water Pump Alternator Mounting Bracket 283 305 327 350 400 SBC
Small Block Chevy 327 350 400 1976-86 Chrome Alternator Bracket Hot Rod SBC LWP
Small Block Chevy Chrome Power Steering Bracket Saginaw pumps SBC 327 350 400
