personally if I were you, I'd look at using an lpg motor out of a bf taxi. Might be the bf mk2 cant remember..and I think you'll have better rods than before someone else may be able to confirm. I'd also use your head that is on your existing motor, though you may have to pay for some machining to get the head and block decked I'm not sure. I dont think it would cost you alot tbh, could be worth doing some homework on it. That would be alot better than fitting an N/A motor and you may have some room to tweak aswell.