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SHOULD BE, BUT YOU CAN CHECK YOUR LOCAL JUNK YARD FOR VEHICLES TO ASK THEM IF THEY INTERCHANGE, I AM SURE THEY WILL.
I remember the mid 70's Jeep had a 6 cylinder 258
Both the 258 and the 4.0 are the same size externally.
www.4wd.com
Yes! The intake should be the same for all of the 258 motors.
Should be the 258 cid I6
6:oo position on cap
The spark plug gap for a 1984 258 6 cylinder Jeep should be set at .033 inches. New spark plugs will be preset and should not need adjustments.
$6800 for 4sp 258 six with softtop and carpet
http://home.sprynet.com/~dale02/vacuhose.htm
Could have a 258 cid I6 or a 304 cid V8
Jeep 258 engine block casting number.