As everyone has said above stick with it, unfortunately Shit happens and we’ve all gone through it. I had an engine builder try abs build me an rb30 countless times and despite being in and out of the car countless times barely drove a kilometer.
i was going to sell it then but stuck with it and just put a stock 26 back in and left it in the garage while I sorted other big financial item out (house)
now I’m building a 2.8 and the machine shop has had it for 7 months and I’ve also been getting the shit but will continue to stick with it because the result will be worth it