What SBC serpentine set-up is this?

[ShadowRuleZ]

I bought this a while back in a bucket and I thought it was from a half ton truck. Bought a new tensioner for it and it's not even close to being right. So I'm looking to get a tensioner but don't know the application. From looking online, it looks like a 88-92 third gen f-body, but those replacement tensioners aren't groved - this tensioner has a grooved pulley. I don't think it's a big deal since the tensioner rides on the back of the belt, but anytime something doesn't match it's typically been wrong in my experience. Any thoughts on the application or on the replacement tensioner? Thanks.

 

[dave89iroc]

I bought this a while back in a bucket and I thought it was from a half ton truck. Bought a new tensioner for it and it's not even close to being right. So I'm looking to get a tensioner but don't know the application. From looking online, it looks like a 88-92 third gen f-body, but those replacement tensioners aren't groved - this tensioner has a grooved pulley. I don't think it's a big deal since the tensioner rides on the back of the belt, but anytime something doesn't match it's typically been wrong in my experience. Any thoughts on the application or on the replacement tensioner? Thanks.

Looks like a third gen f body tuned port motor setup