You need to check the u-joints in the driveshaft first ,if it vibrates when driving.
If it does it setting still, then could be a loose are cracked fly-wheel, Transmission bolts loose were it bolts to the back of the engine block. A bad coolant fan, Bent or broken blade. Check these things and if everything is okay, Then ask your question again.
About 185.
Maybe fuel filter Maybe plugged catalytic converter
yes
Absolutely.
yes
Yes it will as long as the 350 engine is not newer then a 1986
yes
1986
no
It's lean.
lack of lubrication
Yes, I have one sitting in the driveway.