Jesus, the carbs alone are worth double what you paid for the cars.
Do you mean building a blow through turbo setup? It's been done, but Tony D will tell you to skip it and just build a screaming L28et for the same cost. the real issue from my reading with building a L28t engine with carbs is finding the intake side equipment. Either it's a bad design (like the cartech), or you can't find them (SK, HKS, etc).
If I got those two cars, I would pull the carbs, replace them with some cheaper carbs, then flip the '69 (or part it out to collectors).
edit: Actually, if either of those cars has AC, I know someone in SD that'll buy one of them for a good price if it runs well. PM me if you decide to get rid of one