POLL: 360 magnum or 3.58 stroke 340?

-Just a original type guy, I'm stuck on the ole 340, build it, run it, save the 360 Mag for if and when the 340 might give up (IF at all) just my 2 cents..... Love the old engines, as there are A LOT of 360's around, just to have the 340 to "save" it for yourself...Build the 340 over time, and do the 360 now, if you plan to sell one or the other, build the 360 and sell it, to build the 340.....