1981 sierra conversion back to regular gas

[lipikok]

Hello,

 

I was given a 1981 Sierra that currently runs on natural gas. I was wondering if anyone had tips on converting it back to regular gasoline. Natural gas just isn't convenient. Will I need a completely new carburetor or can I rebuild what's on it? I do know I'll have to retard the timing, I just do not know by how much. It has an old 350sb in it. Thank you!

[78gmc1ton]

I switched an 81 back to gasoline from natural gas, I just went to the junk yard and pulled the tank, filler neck, fuel lines and carburetor off a truck that was there at the yard, I also had to get the fuel pump mounting plate and pushrod because there was just a blank plate where the fuel pump went, got a new fuel pump, filter and rubber line at the parts house, hooked it all up and set the timing to 10 degrees before top dead center and let it go. It wasnt that bad a job just rounding up all the parts can be a pain, I hope this helps