Originally Posted by oldschool8604
Someone told me that a port and polish costs about 600...but they didnt know about bore increase...they said something like 1000...i dunno tho, im not too sure
Might check this website: http://www.jeep4.0performance.4mg.com/
Also, you have the old Renix injection system. The throttle body is different than the newer ones (HOs). Check the website for a DIY port and polish. I think its 8-12 hours for a port and polish. You could just do a port match, polish the short side radius and round off the valve stem bosses.
You can also use the Mopar performance head gasket and shave .010 off your head to bump up the compression to about 9.1.