I found a link to this guys site earlier today. Apparantly, this person found a way to graft an LT1 manifold to a pre-87 block. He was running TPI, now he's ot LT1/L98 hybrid. Its truly interesting to see that someone has done it and its a viable design. He's conquered the distributor, the fuel lines, and the thermostat housing issues.
Here's the best part-
Using his project as lead into a better one..... you can set up an LT1 manifold with VORTEC heads. WOW! Wouldn't that be cool?
http://www.lt1intake.com/swapping.htm