here it is i have a 91 4door iv put alot time and cash into,this is a 4.3 i want to swap the tbi for the vortech intake i have all the parts nessisary to do the swap but before i get into this i would like to be sure its gona work so far the only problem i see is the block is slightly different any help would be appreciated

 

I am not really sure why you would do this. It is not much of an upgrade. In terms of reliability, the TBI motor is more reliable. You can do other things to increase the output of your current motor.

If you are dead set on doing it, you will need to upgrade the fuel system to be able to supply the 60+ psi required by the CPI system. Upgrade the wiring harness and ECU to wire up and control the new motor. Plus I am sure there is more to it than that...