No the H series will not bolt up and you do not want to go that way.

Wiring for a GSR is 3 wires (Vtec Solenoid , Oil Pressure Swith) thats it.

Depends on your budget really.

If curvy roads is your thing, i wouldnt spend any money on the motor at all, id do all transmission work, and the best part about that is it wont sacrifice any reliablilty on the engine .

Id look into buyin a YS1 GSR transmission (cable) and a 4.78 ITR Final Drive with LSD.

Itll cost you prob around $1500 for all that, but the car will be 100 times faster with the short gearing.

hell even a stock B16 tranny (s1 or J1) that runs $300-500 with a light flywheel will make the car feel alot more responsive and faster.