my JDM 7m was a successful one, besides me having to replace the head gasket and all of the block plugs and the metal heater hose that wraps around the block because EVERYTHING RUSTED from some jackass putting tap water in the engine and then storing it for 15+ years. it did have low mileage which was obvious from the smooth surfaces of the cams and the piston heads and the crank, and the block is amazingly level and smooth. but when you receive the engine make sure you tear apart and inspect the whole engine because you will be surprised how many things are in good condition to how many things need to be replaced on these engines. ive had my JDM engine for 2 years and it is still an amazing engine!!
so yeah with a metal head gasket even if the block looks smooth i would still take it to the machinist and get it checked and planed aswell as the head because those head gaskets dont form to uneven surfaces very well since they are so stiff, and besides with an NA, id just go with a felpro shucks gasket make sure its the one with the metal sleeves around the combustion and water jacket seals the straight paper one is just plain garbage get this spray in the adhesives section its in a can and its copper based silicone sealant spray and coat the head gasket with it, then use arp bolts and tighten the head to 80 ft lbs and for a daily that engine will be pretty much near bulletproof.
just use caution with those jdm engines.. youll regret trusting something you dont know..
