I would think this is a very personal decision. At the time you decided to go for the Bell/TT system, I assume the Comptech SC was already on the market. Presumably there were reasons you wanted the Bell/TT - different power delivery characteristics, or perhaps just the challenge of making something unusual work. Whatever those reasons, are you still happy with that decision? If you are, and you're looking forward to working through the fuel issues, then go for it! If you're spending every minute regretting the day you got it, then it's time to ditch the TT system; I assume you can still get some significant money out by selling it.
If the money is an issue, you're weighing an unknown amount to make your system work against a known amount to get the BBSC. Once again, a personal decision that no one else can make for you.