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I scored a used Edelbrock High Flow Intake baseplate off of craigslist for a good deal. Problem is I can't seem to identify which one it is and it is preventing me from getting heads ordered for project LowBuck383. The box says it's a 3861 but it appears to say 3860 on the bottom of the manifold. The 3860 says that it is machined for centerbolt head engines only, while the 3861 says its for aftermarket/early head engines. Any help is greatly appreciated! Lots of pics below: