2019 summer race.... Jadaharabi vs 318willrun

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I'm just so confused now.
Should I put the 76 dart back together or should I put the73 duster together?
Should I build a 340 or a la360 or a magnum 5.9? I have all the parts except for a mag cam and set of heads to do all of this.
I would like a set of 35 spline axles and a spool for my dana. Maybe Santa will bring me some.
I have both a 727 an a 904. Both with rmv bodys. Both have turbo action 8 in converters and are fresh. The 904 has the low gear set for lanching that heavy Duster.
There is a 340 and a 360 for the Duster that needs put together. I would just have to choose which one to use. I think the 360 would be the way to go with it.
I think the Dart would the faster of the two with more compresson more cam and more valve but either one would fun.
The Duster has a moly cage but the Dart needs frame connectors.
The Dart has an adjustable snubber and the Duster has slide-a-links.
The nice thing is I have all winter to work it out.
Any ideas on which way to go?