The OP mentions money being a determining factor in the short term. That engine kit will get the car on the road inexpensively even if it isn't an ideal piston. Based on the parts list, I'm inferring a slightly warmer street engine is the goal. That can definitely be accomplished with smog pistons assuming the OP picks a cam that makes the most of cylinder pressure--and octane rating will be a complete non-issue.
1968 Plymouth Fury III 2dr FT, 383-4v, 4 speed
1972 AMC Ambassador SST wagon 360-4v, automatic
2014 Challenger R/T Classic 6-speed
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