[cyclone427428]

I ported the exhaust side of the heads. I have headers and 2 1/2" exhaust with boxed mufflers. When I put the timing chain on I double checked that the marks lined up. Im also running an adjustable vacuum advance diaphram. I tried hooking the vacuum hose at the base of the carb instead of on the side and it only made it worse. I have a stiff spring and a light spring in the mechanical advance. Should I run two stiff springs? or maybe adjust my vacuum diaphram?