Looking to put a big block in my 1990 blazer that already has a tbi 350. I want to keep my fuel injection and use an early 90's 454. I talk to Turbo City today and they said all I would need is the big block throttle body and I would probably have to use one of their chips in my computer everything else should work from the small block. Has anyone done this and I would like to know any other problems that you have come across etc. If it matters I will most likely be using a TH400 transmission. Thank you for any help.