If your Edelbrock heads have round exhaust ports then the 389 would have to have round port heads too for the headers to work. 389 engines never came with round port heads.
Edelbrock in recent years did produce D-port heads (two center exhaust ports look like the letter D back to back) so it’s possible your headers from your 461 would work.
As long as the type of head as in exhaust port style match your headers will work.
Keep in mind that round port Edelbrock heads will have a flat on the exhaust port floor at the port exit flange but they’re still considered round port.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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