I'm gonna agree with Bextreme04 on this. I get the logic of vacuum being less in thin air at the same HP but..... you're confined to a sealed system. The ambient air pressure doesn't matter. Now if you are compressing air it's a different story. Then you'd need to turbo that baby! Think about...
MSD makes great products. I'm pretty sure they include instructions. Usually the first step when installing EFI is to remove all existing fuel delivery system components and throw them in the trash. Something smells fishy.
Is this unusual to have auto hubs on a 84 K30? Never seen them on a Dana 60 before. Not the best pic but it's 150 degrees out and this will have to do.