holley street dominator plz help

I think instead of throwing new parts at it, tune what you have.
In the pictures you posted it looks like the throttle cable does not have much pull to open the carb up.
Also where is the kick-down linkage for the transmission, running it very long with out the linkage will fry the tranny quick.
What gears do you have, if it has a 2.xx something in it, it will be a dog off the line.