My limo won't run

[1975 Fleetwood Limo]

I did get the filter out of the carb inlet yesterday, I cut it open to see inside, did not see any dirt in it. Looked into the carb inlet, it was also clean

[1975 Fleetwood Limo]

After taking the winter off from the project, over the past month I finished putting on a new fuel pump,and had the carb rebuilt,as well as installing a new timing chain set. I ran a hose into a clean can of gas to test fire it. After a minute, she came to life, just some minor "popping" from the carb. Otherwise it ran good, I have to fine tune the timing, get it set to correct specs