All Valiaint experts help me out

ok my 64 slant 6 valiant has a weird high pitch winding noise comming form the speedo/front area when i give it gas but also when it is at a steady speed. What the hell is that, and how do i fix it? Also when i put the car into gear it makes a clunk noise. the u-joint seem to be ok so what is that all about? the car is a pish button tranny btw. Also i am looking to upgrade the rims and tires soon. what is the largest rim i can go without body modes. rolling fender is ok. i was thinking 16x7 with like a 235/45/16.