Not super elaborate, but here are a few of mine.
Dash - Stock speedo, Gas gauage from a LaSabre, Tach, and VDO Guages across the bottom. I need to finish the paint on the bezel
Filled in all the holes I don't need on the firewall. Eventually It'll have aftermarket AC/heat. Also used serpentine belt setup from 94 C1500.
Stock filler neck filled in and tank relocated to rear.
Using an 88-98 style filler door for the stock 72 Blazer tank.
I figure it will look a whole lt better once paint is on and everything is put back together.