Original Chevy GEN I SBCs are all the same. Vortecs came out in '96 and have a different pattern. Edelbrock has "dual pattern" intakes that will fit both heads. GEN IIs are an outlier
I think you're looking for this one; smart investment accepting both spread- and square-bore carbs and fitting earlier heads.
https://www.edelbrock.com/performer-...fold-2101.html
Would definitely steer you towards the Holley spreadbore; if you're going to go rebuilt Q-Jet then use a reputable source - most are junk.
With SMI closed down, only
https://cliffshighperformance.com/ remains IMHO. And they're only selling kits and refurbing the throttle body now I think...