Re: Tongue Groove Porch Fix or Rebuild?
1) I would not go back with wide boards, use regular 1x4 T&G.
2) pine nowadays is hopeless as an exterior wood, so use a decent material like mahogany if you value the labor at all and don't want to replace it again in 8 years.
Our hardwood dealer stocks 3/4x4" mahogany flooring, but we just rebuilt a 30' front porch with5/4 mahogany that they milled for us.
We have also installed 3/4" Ipe T&G flooring on porches but that's overkill and an unnecessary expense IMO.
Remove not the ancient landmark, which your fathers have set.