hello
I can not seem to find any vacuum leeks. the plugs all look fine excepted for #2 it was fowled up and the vacuum gage bounces for 20 to about 17 inches. I wonder if it could be some thing in the valve train. And it pops in the exhaust .

77 stepside, 250ci, Offy intake, DEMON 4brl, headers, ACCEL coil,
I-6 POWER!!!!!!!!