well that really depends on what your gonna use it for, and what kinda cash flow you wanna put into it. Im sure thats what everyone else would say too. Im in the process of putting a 351W in my 90 notchback, and im going carbed. Ill drive it a few times a week, and cruise on the weekends with some track time now and then. But i also like old school, and everything is easy as hell to fix, or should i say diagnose. I have just had stupid problems with EFI in my notch, and in my 89 LX i had a few years ago. ANd its only an OBD1 computer system, so even a diagnostic machine cant always give you a good code when there is a problem. I know a guy that has an EFI 351W in a notch, and another guy who had an EFI 347 with a pro charger and a 150 shot of juice on it, and they both told me already if they could go back and do it again they wouldnt have went with EFI, it just cost to much money. BUt these cars were just weekend warriors. But i am assuming that with a 408 you wont be driving it everyday! haha. ITs just personal preferance, i grew up working on old muscle cars, im 25 now, but thats just what i learned on, and grew to like. I just thought i would give ya my $.02, hope i could help ya a little. good luck