After I got your PM, I dug out this post of yours from August. https://www.camaros.net/forums/showthread.php?t=88798
You are still fighting this problem?
The August post has lots of good pics of T350 V8 cars with Holleys. It does appear that when your car was converted to a V8, the V8 throttle linkage was used, you have a solid rod, not a cable, so skip everything above.
Your throttle linkage "looks" fine in the pic you posted, other than that the rod is kinda tweaked, but that is something people sometimes do to shorten the rod. If you pedal rides low at idle, then you have 2 possible things wrong:
1: Where the lever attach's to the pedal assembly on the firewall is loose. I asked about this in the August post, too. Did you check it? You need to have one person in the car holding the gas pedal tight, while you wiggle the lever and make sure it's tightly attached. If it's loose, you gotta find a way to fix it. That thing is tremendously hard to get to with the motor in the car.
2: The rod is simple too long. Make damn sure #1 is ok, then make or buy a shorter rod to get the pedal at the right height. If you have to, you can make a rod out of a piece of 1/4 - all thread from the hardware store and a second screw on fitting like the one all ready on the front.
There could also be issues with clearance at the firewall. Sometimes plug wires and stuff get messy back there and prevent full travel. Note this won't effect the ht of the pedal at idle, but when you floorboard it, the lever should come all the way back, almost touching the firewall.
Your kickdown linkage does not look right. It is too loose in the pic you posted in the August post. The pin in the carb linkage should be all the way at the front (but not so tight it moves the cable) of the slot in the cable end.
It's been 20 years since I had a T350, but I think the cable is adjustable, either at the top or the bottom. Your setup looks right, it's just too loose. This is effecting your shifting.
I would disconnect the trans cable from the carb, deal with the throttle linkage first and get it right, then deal with the trans linkage.