They are loose or worn out. Also can be a pulley with a bad bearing.
No, it will not.
A 1998 Jeep Wrangler does not have EGR.
Trim package
yes
No, they are different
Will a 304 engine fit in a 1998 TJ jeep wrangler?
no
YJ to a TJ, no
yes
Yes
Yes
30x 10.5