Join Date: Mar 2003
Location: Fairbanks, Alaska
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Re: Is the 304 in a CJ and a scout II compatible?
IN short NO!! The AMC/Jeep and International 304's are completely different internally and externally. A International 304 would be a very expansive and poor choice for an engine. For your information International used a 232 and 258 that where basically AMC 232 and 258's but used different blocks with different external bolt patterns. This has lead many to assume that the International and AMC 304 is the same internally IT IS NOT.
Provided the 258 you mention is an AMC/Jeep 258, it should bolt in with only a change of driver side motor mount. Be aware that you will need a 258 flex plate as AMC engines are externally balanced. Also will want a torque converter matched to the 258 for good proformance and mileage.
Of the engines you mention the 360 would be the best choice, Provided it is a AMC 360 and not a Dodge 360 (Completely different engine). It should bolt in directly needing only a Flex plate balanced for a 360 and may need a different Torque converter for best performance and mileage.
If you plan to stay carberated they An AMC 304, 360 of 401 will be the best bang for you buck. If you want fuel injection then it would be best to swap in a fuel injected AMC 4.0, Chevy 305, 350, Ford 302, 351, or Dodge 318, 360.
For your information the Holly carb is not stock, the stock carb would be a 2 barrel motor craft (MC)2100 with 1.08" venturys. The stock Auto trany is a TH 400 this is internally similar to the Chevy TH 400 but with AMC input and output bolt patterns.