I know this is a little late, but maybe others can use the info...
The hot ticket is not to use a grommet, but a bulkhead connector from say Delphi or Deutsch. They make all different sizes and shapes, are waterproof, and compact. To give an idea, look at these attached pics:
To cover your harness, use the expandable tubing/flex loom, which is easy to work with, and looks professional....
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1971 Lemans Sport 461 bottle fed daily driver
1971 Trans Am 474 blown EFI pro tour car
1972 442 W-30 clone
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