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The biggest pain i remember was retaining a cabin heater actually, ill tell you i needed to have a heater for roadworthy purpose (as a demister) but really truth is i dont like being cold
The copper heater in/outlet pipes passed through the firewall exactly where the aftermarket fuel rail sat, it looked and sounded easy to overcome, but i recon i spent longer solving that issue than any other single problem during the whole conversion.
I also had a limited single car space in my garage to do the conversion, the only way i could get the car in far enough to close the garage door at the end of each night, was to sit the engine back in the car, and fold up the engine crane and stand, i think i must have had the engine in and out about 30+ times, amazing how good you can get at doing it by yourself.
I had been running a 186 Turbo engine in it for about 10 years before, going to the RB30 was by far the best thing i ever did.
I can probly try and dig up a link to my build thread on it if you like ?