They look like Hedman Elite Hedders for F-bodies to me.

If the collector end is the ball-and-socket style, they're most likely Hedmans.

Cheap? I've used Hedman Hedders twice and the fit was perfect each time- once on my '77 van w/360 (Elites) and again on my '77 Aspen's 360 with Schumacher conversion mounts. Not a single dimple necessary. Guess I'm a fool for not buying TTIs.