Which spacer for 1965 273
If you have a die grinder, you can open up the throttle bores to 1 11/16" easily enough. Then the throttle butterflies clear w/o an adapter. The Edelbrock has extra mounting holes and will fit early intakes with the smaller mounting bolt spacing. A Holley doesn't have extra mounting holes and requires a spacer to adapt. Here' a 56 Packard intake that I opened up the throttle bores to run a 650 Holley double pumper on what was originally a WCFB intake - and yeah, I needed the adapter for that setup.
If you have a die grinder, you can open up the throttle bores to 1 11/16" easily enough. Then the throttle butterflies clear w/o an adapter. The Edelbrock has extra mounting holes and will fit early intakes with the smaller mounting bolt spacing. A Holley doesn't have extra mounting holes and requires a spacer to adapt. Here' a 56 Packard intake that I opened up the throttle bores to run a 650 Holley double pumper on what was originally a WCFB intake - and yeah, I needed the adapter for that setup.