Northwind is a good option. Wilson Manifolds will do the EFI conversion for $950 which includes everything. You just need to send them injectors. (BTW Funkhouser Race Cars did my conversion, using Wilson's parts).
https://www.wilsonmanifolds.com/page...on-conversions
If you don't plan on going forced induction, Accufab makes a nice looking low profile 4 barrel efi throttle body. I haven't used one so I can't comment on any installation issues.