Holley or Edelbrock carb

Holeys leak, Edelbrocks don't. Holleys are generlly cheaper unless you buy one of ther blinged-up Avengers. On a basically stock 318 a Holley 1850 would do just fine, as would a 1406 Eddy. A used but rebuilt Carter 9636 would also be a good bet if you come across one for a good price.