Outstanding fit and finish. These guys know what they're doing. This worked perfectly, adapting my original factory Quadrajet to an Edelbrock electrochoke with no permanent modifications. This gives me peace of mind returning to the Q-jet once it's been rebuilt and upgraded to an electric choke made from rotted radiator pipes. The gaskets make a good seal, but if you plan on installing these exactly like I did, you'll need to pair them with an ICT billet throttle blocker plate and possibly an EGR removal blocker plate.