Hard Gas Pedal in 74

[ClassicNut]

Changed from straight six and 3 speed on the column to 350 with 700R4 transmission. The gas pedal is very hard to push. We have used different springs on carb, new cables (both gas and transmission kick down). We thought it might be in the transmission as it had a full shift kit. We were going to check the springs in the transmission (found out the transmission was a mess). Ended up rebuilding the transmission. Still have the problem. Also had an angle on the cables going to the carb. Raised the mount so they are now straight. Does not feel hard at the carb. At a loss for ideas. Any help would be appreciated.