Realy there is no reason not to pass smog with a maf car...its not so much the maf but the little things that need to be changed. Alittle fine tune at idle with the maf prob. or going to forced OL (or is it CL, I always get them mixed, were the o2's are forced off). to fix a fat idle at most.
Now if your running a 800+rwhp pushrod that makes power well over 7,500rpm then you realy should be looking at a whole aftermarket efi setup.
If you undo the maf I am preaty sure it would go into "limp" mode and run like arse. I realy dont think there is a way to turn if off.
on a side note--
damn those 87sd mild bolton foxes sure did run like mad v. a maf fox with a few boltons.