1967 charger 383 2 barrel performance mods

The heads are supposedly stock, which would be close chambered 516 or 916 castings if I'm correct. The stock 2 barrel engine was rated at 270hp, 4 barrel at 325hp. It does have dual exhaust now, with factory manifolds. 383-2 was rated 9.2:1 compression, 383-4 was 10.0:1.
Fender tag says its a 383-2. Owner states it was rebuilt .030 over around 1000 miles ago.
No info on the current 4 barrel or intake thats on it.
And yes, I'm gonna buy the whole car. Its in excellent shape from the ton of pictures he's sent me. Haven't seen it in real life yet. He's 4 hours away.
Well congrats on the purchase and wishing you all the best luck with it.