So apparently I posted this thread almost 10 years ago asking for help: 
http://www.njfboa.org/forums/showthread.php?t=44457
I'm again in the same boat.  I now live in 07762.  I've gotten the starter disconnected and almost out from under the y-pipe but I hit a dead end.  Reading that thread, I must have hit the same dead end 10 years ago (lol... well not really).
I never got the LT4 starter in but ran to Advance Auto 10 years ago to get a stock starter.  I now have an AC Delco starter from Rock Auto ready to go in.
Is anyone willing to lend about 1 hour of help to help me get over this hump?  I suppose my hangup now is I need to loosen the y-pipe on the mac shorties/borla exhaust to get the wiggle room to clear the y-pipe.
If you're down for lending an hour of help (and have a few tools to bring to help get it done), I'd much appreciate it.