to get the wiring side of things fixed, grab a pre-made better than factory quality harness from Wiring Specialties 
amazing harnesses!
literally plug & play in 15mins, worth the cost in my opinion.
bought parts off of him a few times, good guy and I know people that have had work, they couldnāt be happier.
Riyad is a great guy to deal with straight upfront and does not do shitty work in my opinion. 5500 could get you an RB swap from him with everything working proper.
Check out you tube there is a guy in the states that sells a dvd for 25 showing full sr swap into an s14.
Good luck
If this is the same Riyad that weāre talking about (he used to drive a purple civic coupe) then I can add that heās a good guy.
Also, everyone has to keep in mind that when it comes to doing an engine swap or any kind of custom work, there are a lot of unseen/unknown variables involved. i.e. the condition of your carsā internal wiring, wiring harness, frame damage from before, and so many other things that might be on its way out.
At the end of the day, thereās only so much he can do given the parts that you have supplied him with.
Thatās why you should always go with a front clip and make sure it starts and idles properly before removing it from the clip. (itās extremely easy to rig up a fuel pump with a mini āfuel tankā to test your clip)
Yea heās actually getting motor from front clip for me. Iāll ask him if I cam hear it run before installing.