Given the condition of your engine a freshin up wouldnt go astray but depends on your overall goal aswell, and if those goal posts will move every pay!
Biggest bang for buck with any Honda ( or FWD ) is a lower final drive and lsd, ATS are pick of the bunch for final drives and Quaife's for LSD's but there are some good final drive kits on Honda tech out of the states that are well priced and lsd's can be had second hand or look for decent 2nd hand honda item, not the best but on a budget are fine.
Shop around and with labour lets say $2k
With 4k left id split the motor, get a set of U.S higher comp aftermarket pistons, mod your current rods to accept a floating pin, and freshin up the bottom end......pistons, machining, bearings and gaskets and assy ( incl strapping the head on later as per below ) $2k
Get your engine builder ( Someone used to hondas! ) to just clean up the ports ( type r style ) and have the head serviced with a good 3 angle valve job $500.00
With 1500 left you'll fall abit short ( but not too much ) of getting yourself a pair of type r cams, skunk or copy type r manifold and T/B or OEM item if your hunting around and address intake and exhaust, Mugen intakes and Toda headers cant be beaten on B16's no matter how worked they are.... apart from quads but still to this day not many custom headers out perform the off shelf todas on B16's, though this changes with the bigger 1.8-2.1 big bore/stroke motors.
Standard ecu can be chipped to suit a slight rise in comp but sure a new ecu wouldnt go astray but this is always something like headers and exhaust that can be upgraded as funds become available and how keen you are to spend more.
You dont want to go splitting the engine or box often as your off the road and its expensive so id address these 2 items first and properly then everything around it can be upgraded easily as you go, you might be happy with your intial spend, but like most of us,
once you pop open a honda.....you just cant stop
Hope this helps!
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