Great! this is such a huge help.
on the 4 center bolt holes what exactly do I need to do to them to make it work with the early heads? do I just take a file or drill to them to them and ream them out to the proper angle or do I need to drill new ones. If I have to drill new holes is there a need to weld up the old ones? I already have a 87 + manifold so I'll just use that. I guess Im missing the mass airflow sensor on here. What are my options? do I have to run one?
Also on a different note my friend had a set of 86 + heads off a 350. Do these heads have the correct bolt angle and should I use these heads over my mid 70's heads?