how can i replace the SCC on an 84 ram p/u with slant six and feed back carb, and still have it run without the SCC

 

You need to convert it to the regular Mopar Electronic Ignition but I believe that their kit part# P3690789 is no longer available from them.
You might try posting at this site for some help.
http://www.slantsix.org

http://slantsix.org/articles/leanbur...rn-article.htm
Also, you could pick up the individual parts at a junkyard or auto parts store.