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if your doing a Rx7 why not put an LS based motor in it? its been done and a proven combo. Not to say the gen III isnt good but if your starting from square 1 go with the LS, people making that HP easy on stock blocks and some cranks. FWIW I have a 70 duster tube chassis car and my new motor is a 582 BBC dart block BMF heads I am at 10K OTD dynoed. I priced out the mopar stuff B1 heads are like 7k a short block is 7k just adds up and wont be as much HP for the dollar. All that said a gen II hemi would be the most eye catching.
ohh and what year is the RX7? If its 93+ check out hinson cars they make all the stuff to put the LS in without tube chassis



might as well hang a chevy II shell on it and call it a day.