guys i've seen and driven this truck it's got 4.88 gears, and does not have fast acceleration by any means.
Stock aisin, dizzy, and all ignition components...
It has NO TOP end. Will not rev past 2300 rpms. And no he's not dumb, the issue is not with the dam switch on the back of the tach for different cylinder settings.
It just starts to backfire and pop when it hits 2300.
I took the dizzy cap off and cleaned the pickup and starwheel. Engine runs very smooth at idle and lower rpms. Almost feels too lean. I'll have him pull the plugs and see what they look like.
I also have a feeling the secondary on the carb is not opening, like i said feels lean .
No one called him dumb......He said he didnt know what switch I was talking about and wanted me to explain......Glad you're on the job now and can take care of it.....badass.....