Below is a link to my homepage of the L67 swap into my 86 Cutlass which is the same chassis as an 87 grand prix. It started as a 96 firebird 3800/auto arrangement and progressed into the L67 swap. Drive by wire wont be a concern until you get to around 2004+ engines and one less headache to worry about. 99+ 3800 f-body cars use drive by wire so using an 97-98
pcm makes the swap easier. A lot of custom tuning will have to be done. For security bypassing I built a bypass module off of a schematic I found years back to feed the
pcm the proper signal to keep it happy but now tuning should be able to get you around that.
Trannymans Project Site