help on tune up and carburetor issues

[Boog]

I'm with wrenchbender. It sounds like the ignition is not advancing properly. You replaced the normal electrical ignition parts but if the centrifugal advance is n't moving freely it will have next to no pulling power. The weights and springs under the rotor cap need to be clean and move freely. Twist the rotor by hand. It should move but spring back when released. If it doesn't the distributor shaft is likely gummed up down in the housing. It can be disassembled and cleaned or you may elect to go with a new or reman'd unit. 12 volt power supply and it should be good to go.
Most tuners agree, get the ignition right first then the carb.

[centuryhouse]

A little additional info.

The carb is a Holley 4160 (List 1850-2 2731) 600 CFM unit.


And this is the thing (not sure what) on the brake booster:

[centuryhouse]

A minor update. I took whatever that thing pictured below is, off. And the truck seemed to run either the same or slightly better, hard to tell. No idea what it was, or what it was there for.

Also, I took the cap & rotor off and looked at the internals underneath. Everything seemed to move freely as it should.

Next is probably procuring a timing light. I don't see any timing marks though, so I may be looking in the wrong place. The last time I messed with timing was 25 years ago on a Mustang, and it seems like the marks were on top of the harmonic balancer.

Originally Posted by centuryhouse

And this is the thing (not sure what) on the brake booster: