2 phillips screws on either side, it will only go on one way but make sure you line it up with the old one and transfer plug and coil wires one by one to match before mounting it and tightening screws.
yes
It is inside the distributor.
A 1998 Jeep Wrangler does not have EGR.
you have to take the tran out. then it will slide off
Yes.
Trim package
no
Yes
Will a 304 engine fit in a 1998 TJ jeep wrangler?
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The distributor is set to 0 degrees with a scan tool. You cannot do this with a timing light.