Tri-Five Big-Block Install - Fat Rat In A Little Hole Photo Gallery
The left and right corners of the firewall's bellhousing tunnel need to be blistered. What is a blister? It's an indentation in the firewall in order for the valve covers to tuck up into and allow for a proper engine fit. You can see where Darryl's crew has blistered the firewall. This would also be a good time to go ahead and smooth the firewall.