I would do this swap not based on cost but more so reliability and ease of maintanence. Going with the BEAMS engine eliminates the worries of DI seals burning up and AVCS failures some are plagued by. Servicing will be a walk in the park (sparkplugs!!!) and doing a turbo kit would be much easier as it will now hang off the side of the motor instead of coming from up and underneath as seen with the FA20. I've talked to a car builder about our FA20 and he has come to know these engines as being hit or miss. He told me that once the case has been split, all bets are off as tolerances are a 50/50 bet that they will be back in spec.
I just don't have much hope in the fa20. But it would be hard for me to rip apart a brand new car to do an extensive mod like this. A clapped out e30 shell would be more fitting to create a Frankenstein.
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