Before I put the dash all back together after the YJ Brake pedal swap, I decided to do the heater blower motor upgrade.
For those of you that don't already know. Get a blower motor for a 73' Blazer with a 350 And (No AC). Open up the hole in the fire wall a bit and it bolts right up.
I also put in a new Heater core while I was at it. I figured the old one is 25 years old and I don't want to do all this twice down the road if it started to leak.
Hear is a picture of the new heater core in place and the heater box getting a bead of black silicone to get sealed back up.