the 4.2 mounts will bolt in but the trans crossmember will need moved, this will change shifter location a little, no big deal all factory bolt holes are already there. if u can find an early 4.3 (think 1986) like from a astro van they were factory carb motors. ya the sr4 will work with a 4.2, they came with em, but alot of folks feel there marginal even for that. i just did a full rebuild on my 151, with hypereutectic 9.25:1 pistons, valve job, gasket match, blended bowls, schnieder racing 256 dur cam, stock carb and exhaust. its pretty damn snorty with the new 4.10 gears and still gets 18-19mpg all the time, just a thought. i can send ya some specs and even tune info to build a good engine combo that i know works well, and can b done for reasonable $. i have some sbc swap parts inc 153 tooth flywheel, and t176 trans if u decide to go that route ill cut ya a deal. i was gonna put in a 283 im building, but i really like going 260+ miles on a tank of gas.
Last edited by rodjr; 04-18-2010 at 04:11 PM.