heres my 2 cents on your setup which is similar to mine...

1) what would be a good cam for this setup keeping in mind I want to convert it to EFI? I'm not sure if the newer self tuning efi's need strong vacuum signal at idle. personally i like the mopar 528 mechanical cam, i run the 557 lift cam in my 446 but for efi the 528 cam would do better
2) Is the juice worth the squeeze to go with a hydraulic roller? for a street car probably not.
3) considering this is a street build, is getting the cnc ported source heads necessary? for a street car probably not
4) the EZ efi 2.0 that I bought 7 years ago is still new in the box. I see they still make it. does that mean this is ok to use or is there some other throttle body self learning system I should be considering? use what you go. both the sni[er and fitech all seem to have their successes and failures.

also i'd stick with the smaller headers.