Okay so I got my timing set both Mechanical and ignition. Now I need to know where the vacuum hoses should go to my 5200holly caberator on a 2.3l 78 Ford mustang II and I also need help figuring out if the distributor is ported or not and how to tell if it is basically I'm new to a carberator...

I have a 64 comet with the Rod and Custom mustang 2 front end kit. We are installing a 408w in it and would like to know what headers actually fit with out modification. Has any one actually gotten long tube headers to fit and what was the part # or application?