slant six build help

ok we are building a slant for my old dart for my son.
this is what we have so far .

slant head w/oversize SI valves being ported and polished

he wants to run the Ausie Speed intake
possibly there headers too (unless we come across a used set)

for now we are using a cast crank low mile short block we have
re-ringed and new bearings (plan on doing the oiling mods from the slantsix.org articles)

we want to mill the block not the head to raise the comp. (possible turbo or supercharger short block later) how much should we mill it?
(premium pump gas or race gas mix ok)

cam recomendations how much lift and dur. can we run w/o reliefs in the pistons. who"s cams do you rec. or warn against?

timing chain options? roller rocker options?

its going to be a auto so a stall convertor will be needed

any and all advise would be Greatly appreciated.....

Thanks Dominic & Jeremy