If he upgrades in the future then by that time the heads will likely need freshening and can be ported along with a matching intake at that time.
Right now he has a good chunk of change invested in his exhaust manifolds and associated items to make those work. Those of you saying to put on some headers are missing the point of his post. He’s running long branch manifolds and is asking if porting would be useful and depending on your opinion it’s either yes or no, he’s not adding headers or a 3” exhaust.
I would save my money and run them without porting keeping the 1.5 rockers if it were my car, it will be a nicely matched combo with the stock intake and exhaust manifolds.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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