So many questions!!!
Ok...
Firstly, the big port is an easier swap because you can get the proper RWD inlet and exhaust manifold, so I guess it would be easier and cheaper to find a FWD AE82 4AGE and convert it to RWD, though the parts are becomeing a bit rare (ie water pump etc)
$500 seems to be the going rate for a 4AGE big port, you might even find one with the ECU and loom
$1400? If the G'box is genuine JDM and the Loom is comlete i'd say yes, but depending on the Kms (JDM boxes go for around the $600 to $700 mark by themselves) If the 4AGE is already in RWD format all you'd need to do is intergrate the Loom into your own and its done!!!
(Not forgetting the fuel system of course)
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