[Mike C]

The centerbolt valve covers are a giveaway you have 87 or newer cylinder heads. Look on the block back where the bellhousing attaches and you should see a casting # or possibly a displacement casting (5.7l or 5.0l) if it is a later block as well.

You have a long pump on yours. The alternator bracket is one of the giveaways as well as the reinforcing webbing on the pump itself. You can see enough of the pump that you can tell it has about 1/2" clearance between the rear plate and the timing cover.