Edelbrock SBC Performer Intake Manifold with EGR port 305,  350, 383, 400 - Looks Very Good. Not painted or gussied up so you can see what you are getting. I see no issues with the threads or otherwise.

Some generic data:

CHEVROLET 262-400 SMALL-BLOCK V8 PERFORMER - '86 & EARLIER (IDLE-5500 RPM)  Designed for street 1955-86 small-block Chevys. Performers accept late-model choke, water neck, air-conditioning, alternator and H.E.I.  Not for 1987 and later cast iron or Chevy Bowtie heads. Will fit 1987 and later stock aluminum heads.