I could use your opinion

I have a perfectly good running 170/6 in my 66 valiant now with 62k miles on it.
I have a new head being built little bigger valves and I think 6k being shaved with just a small amount of clean porting for a good driver and just a small cam, passably just a RV lift and duration.
My question is should I go ahead and build a new 225/ and set my original 170/ aside on an engine stand if one day I want to pore some $$ in it for a HP maker ????? We all know headers are not an option on the 170 yet and I think I would enjoy having a 225/ under her bonnet :-D Thats an old word for hood :toothy10:, Like turtle hull is for trunk lid 8)

Thank you for your input and wisdom on this, Victoria thinks she wants a long stroke 198 or 225 in her :clock:
My offy 4 barrel intake has been doing great, But I am thinking the two barrel might mix better being centered ?? with a 500 Holley.
I sure would like to get all the /6 guru's input if I can :happy10:
Thank you for your thoughts on this