Which manifold for my 383 build?

That engine, being a short stroke BB, should make power deep into the 5k range, so i'll just rank your current choices.....

1) Offy - Probably the best of the bunch for a overall street performance car.

2) Torker - If I recall correctly, the runners are fairly small by today's standards. If you want to emphasize high end power (4000-6000) that one may be workable for you?

3) Tarantula - Forget it! I'd only recommend that for a bracket car with lots of converter & gear.