Unless you just want to pay for the look of that engine, I'd forget it and build a good stroker small block. The stroker would have the advantage in weight, power, price, and ease of getting parts. The hemi just looks cool. Your choice.
I take it you've never seen a set of early Hemi heads. Is it heavy? Yes. is it expensive? Yes. As for power, the Early Hemi is THE one engine that NHRA bans because if it is allowed to run it will come out on top...
