72 850 spider acceleration issues

[TNmtnboy]

I have a '72 850 Spider that will barely climb a hill even in first gear. Once on flat ground it accelerates and takes off. Hoping for some advice on what to do next.
Here's some details and what I've tried so far:

Car has a "mild" replacement cam.
Recently rebuilt head.
Rebuilt 30DIC carb, torn completely down, jets cleaned, rebuild kit installed. NA market smog stuff has been removed and capped off.
I have only used non ethanol fuel in it.
New Facet electric fuel pump and filter. (had this acceleration issue prior to the electric fuel pump install, but condition seems to be only slightly improved since)
Idles at 2000rpm adjusting the idle screw seems to only barely affect it.

I am wondering if it could be a timing issue, or possibly a carb issue? Any suggestions would be most appreciated. Thanks!

 

[dnudelman]

wouldnt hurt to check both the cam shaft timing and the ignition timing. Might want to do a compression test.

 

[Dr.Jeff]

I have a '72 850 Spider that will barely climb a hill even in first gear.

Sorry to make fun, but I almost wondered if this was a joke. But seriously, no disrespect intended, I love small cars with smaller engines.

 

[dllubin]

Have you checked for vacuum leaks yet? If it is idling at 2,000 rpm air must be getting in from somewhere and perhaps you have the idle screws opened up enough to get a combustible mixture with a big leak.

 

[kmead]

You might want to go back and check your float level. If too low then there won’t be enough fuel to keep the main jets under water so to speak.