There's an engine shop on 184. They got me a set of stock 350 heads ready to bolt on for $600. I don't imagine a 4.0 would be more than $350.
I think it's L&L Auto machine service 445-8075. Going from rt 12 down 184, it's just past walmart on the right. On the left you pass the Acura dealer, then the little dealer right next to them, Look right and it's just past the equipment rental place.