Valiant duster 426 hemi ?

Hi guys...as some of you know i bought a solide project car a 70 fj5 4 speed 340 duster, disassambled the 340 good but need to be brought to a machine shop , i have a siamese 426 hemi gen 2 with aluminium heads , waiting for my long term 70 project but $$$$ buying a house next summer etc the 70 hemicuda tribute will take a while..so my 426 hemi is collecting dust and the duster is 10x more solid than my cuda shell , thinking of doing a steelies 426 powered duster , but im separated in 2 , putting the lil 340( match number ) back or putting the 426 hemi in the duster and enjoy it , what you guys would do ? Dont want to drive my cars only in the next 4-5 years

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-------Hemi? -----box that ***** up and send it to me, I know what to do w/ it !