Trying to save my dad's truck, he passed away last summer and the truck has meaning. I've been working on it for the last few years replacing parts that were worn out and broken. I've replaced a weak fuel pump and several questionable vacuum lines along with the fuel filter and the pcv. Fuel pump was only putting out 35psi, lines replaced were cracked and the filter and valve may have been original. Last week I did a new coil pack due to misfire on 3/4 and the plugs along the drivers side had rounded electrodes while the passenger side still looked new after 80k miles.

I'm thinking that the fuel rail or the cross over line is partially blocked given that the three plugs are showing obvious signs of hot detonation. I have had no luck finding a new set of rails through the chain stores nor rock auto, would anyone know who would have them? If it's not available anymore would it be possible to get regular fuel line and replace the pressed on line and use hose clamps secure the new line in place?