Not even close!
You also say the heads been ported. Any flow figures?
Because there's porting...... And there's PORTING!
To give you an idea.
My L28 is bored 3mm over, PORTED!, forged domed pistons, long rods, pretty big cam, good headers, 2.5" exhaust, modified dizzy, triple 44PHH Mikuni's and so on.
I've got 146 rear wheel kW's. There's more with exhaust and cam upgrades.
But estimate the set up you're talking about to be 80-100kW's. (Being generous)
You're a young bloke? If you get 110kW's in a Z, you'll have a blast. Do brakes and suspension first.