Now is definitely the time to decide: Build the 292 or sell it and get a V8.

That said I'd probably just get what you've got running on the cheap and try it out first. Besides if you do sell the 292 you'll get your money back out of it if it's running when you sell it.

Don't be afraid of carbs. They're really not tough to work on. In fact they're probably easier than EFI because they're less complex. Besides if you just worry about getting it going you can spend more time and effort on the rest of the vehicle.