Unless you are after the "cool" or "WOW" factor of a Hemi, I would build something else. Big or small block, I would bet you would spend just a fraction of the money to get the same power.
FWIW, a guy at my local track has a 1965 (I think) Belvedere with a Hemi...and he usually runs in the high 7's in the 1/8th...my pump gas stroker small block runs runs high 6's in the 1/8th...both are "street" cars.