You can run either carb. the Holley or the Edelbrock. And because of the fact that the carb sitting 90 degree to the intake The stock linkage will not work. I have made linkage to help in this matter and for those who do not want the cable linkage. and works pretty much with most stock linkage with less mods.
Take a look and see if this may help.
http://www.homestead.com/memorylaners/MLRS.html }[oooooo]
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NovaMan/Twisted6/Larry