Indy head questions

So I pulled the trigger and got a set of Indy heads and I am now starting to put the engine together, and I have a few questions. #1 when installing the valley plate do you guys put any rtv or the like along the head/intake edges of the plate, where it gets captured by the heads? #2 do you have to run longer head bolts with the Indy's vs stock heads? #3 How big of a bore head gasket can I get away with on my little 383, the closest size I can find is 4.380 which is quite a bit larger then my 4.28 bore. And lastly is there a different torque spec for the heads since they are aluminium?