edelbrock slingshot
 

how can you tell the difference between an original manifold and a repop?

Re: edelbrock slingshot
 

Pretty much just by the way they look (I know, not much of an answer). All the modern slingshots that I've seen have a 'Made in USA' badge on them and the aluminum tends to have more 'shine' out of the box. Also, the pattern is just a bit different. Here you'll see both - the area in the front (below the generator) is obviously a bit different.

Notice the thickness and depth of the area where the generator bolt attaches - that is easy to pick out.

Attachment 308020

Attachment 308021

Attachment 308022