^ ummm the engine already has mhg and arps hehe
jdm = japanese domestic market
if it's absolutely perfect/mint/unbelievable brand new off the showroom floor condition then maybe
but i would try to haggle him down a bit
oh and also... try finding a 91 lol.. they're not overly common
do you by any chance know what the head was torqued down to? it should be 82-85ft lbs
by him doing the headgasket it does save you doing it