I got this idea from viewing these Ford adapters. 302 to 351 and Cleveland to FE. Would allow use of Edelbrock Performer or Offy 360 single plane for 215/Rover on the 300.
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Here's a 350 Buick lower with a SB Mopar top. Maybe gut a 300 2 barrel intake to fit Rover intake and do the same?
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It'd take a different upper but maybe...
Also might cut down a 300 intake like that and use it as a spacer for a Rover intake. Not sure how well that would match up but it should be really close.
Jim
I may end up going this route if Anthony doesn't complete the 300 intake by this summer. Im no expert by any means but it looks like combining the 2 intakes (pan cover& intake) could be made to work.