Ok first i think you mean you have a 4g64 SOHC....Now on the turbo you can turbo a SOHC and it will be fine the bottom end is what is the problem not so much the head....All 4g63 parts will fit the block...Now you can buy just heads off of ebay and maybe a few other places...The 1g Eclipse head will flow more than the 2g cause the intake and exhaust ports are larger on that compared to the 2g...But to take advangtage of the you either need a 1g intake or a ported intake manifold....As for the exhaust and turbo and 4g63 turbo exhaust will work for you.....Use the search button and you'll find everything you need!
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