The only shop that I'd recommend for SOHC4s in the tri-state area is House of Honda in Mamaroneck, NY. I've never had any work done there, but they've had a part or two that I needed in stock.
Circle Cycle in Ridgefield, NJ is a decent shop, but I don't think you'll find anything special for SOHC4s there.
Amol in Bergenfield, NJ is closed now, Bergen Sport Cycle in Lodi, NJ is way overpriced. Camrod/Motorsport on 11th Ave is a tremendous ripoff for service, and never had anything I needed in stock. Cycle Therapy on 39th is a ripoff for service, but might have some used parts in stock.
That about taps me out on local shops. I do most of my parts ordering mail order, and do all my own work.