bump steer could definitely come form alignment if you have changed parts.
On the temp, do you have an underdrive pulley system? That slows the water pump down. Especially at engine idle speed. Do you have a shroud? They really do help pull air thru the rad, again especially at low engine speeds when not moving. Those two things are pretty important. Also, what pressure rad cap? The higher you can go the better (like 16psi), however the older original type rad cannot handle too much pressure. Usually around 13psi before they start blowing out the seams. And of course you want to make sure there is no air in the system. Also what blend of antifreeze? 50/50 is typical but antifreeze is not a good coolant. It just doesn't freeze. Water is a better coolant so in summer you can run a higher ratio of water for better cooling.
I struggled with a hot engine in traffic with my 67, it would run fine (about 180) on the highway but would climb as high as 240 in traffic on near 100 degree days. I wasn't running a shroud and I had underdrive pulleys and a 13psi cap. I incrementally changed all of this (except I still have underdrive pulleys) including running 15% antifreeze and water wetter. It made a big difference. I can sit in 100 degree weather in traffic sitting still and it won't over heat now. I did drop it in neutral to bring idle speed up when sitting but since I went to a 2400 stall speed on the TC I don't have to do that anymore. When I swap in the 5 speed I am also changing my waterpump pulley and putting on an Edelbrock high flow aluminum water pump.
Anyway, hope some of this info helps