you say not generally but thats how it is.supply and demand.the original hi rise f and d intakes start around $2500 for a good one,and they work well in nhra stockers like the fairlanes,in the 9s in stock legal trim.why not use one of them?
on another note,sohc intakes can start at$5k,like the ones on ebay.
there is another alternative,have one cast for you.wih the new tech in printed sand molds for aluminum castings,its not as cheap as regular castings but it can be done,just need the digital designs for.