oh boy...
So, if you do get longblock, you will still need to buy a gasket kit for header/intake/etc...
At same time depending on mileage of vehicle you might want to replace other hard bits that while the engine is out of car. Ie.. Water pump / Rebuild valve body / Transmission / Spark Plugs / etc..
Then on top of that an engine management. It seems you can go w/ an uprev however for the motor etc.. you would use, i highly suggest against it as it maxes out pretty quickly. the engine management would be something like pro-efi or HKS F-con pro. Both cost upwards of 2k +. Then lets not forget the tune. An average tune cost from 500-1000 dollars. (This is an area where i would not skimp on at all). Now don't forget that when you do go FI you will need to drop $$$ on a turbo kit which starts at 5k for anything decent. Then on top of that customize the IC piping as it is not meant for m35. Then you will definitely need a bigger radiator / Oil Cooler / Transmission cooler / Gauges.
So at this point.. you have maybe 5-10k on motor and another 7-15k on your turbo and accessories.
One thing i forgot is the bigger injectors which range in the 500+ range for a set of 6 (Some do come in the turbo kit) however those may not be enough as you will be boosting high w/ your new block. Then on top of that you will also want to go with a return fuel system. The factory fuel system is returnless which makes FI a big pain in the but.
here is my car's mods...
http://highoctanetuners.com/Joshz33.htmlI think in the turbo and accessories alone, when new. was 13k dollars. and that is with me doing all the labor myself and without a built block..
Please do more research before pulling the trigger. Ideally, you should have a plan / a power goal / and have some discussions w/ tuners in your area as they will be the ones tuning your car. Having a 2k dollar engine management will be useless if no one in your area can tune it.
Good luck and happy modding