Dilemma with 73 C/10

[gashog]

Picked up a good running 73 short step with a rebuilt 350 and a 400 turbo for my sister to run around in, she's been wanting one for 20+ years. on closer inspection I see it WAS a 454 truck with bucket seats (gone) and posi (still there). now I'm wondering if I should try talking sis out of it before she pays me the $1200 it cost me, and put in the 454 I plan on sticking in my 69. The P.O. say's the guy that installed the 350 was nice enough to get rid of the old 454 for no extra charge "what a guy" Anyone got pic's of a moss olive truck with slate green interior, sounds kinda cool, its painted burgundy with black interior now but needs redone so why not just go original. What would you all do.