No, they aren’t cheap at all, and I’m personally not a fan of Dynatech or JBA(the 2 that I know of that make the swap headers). Alot of people are just taking 351 swap headers and welding LS1 flanges on. I hear it fits perfect and bolts up to fox exhaust without issue. Also, guys are using 2010 and newer camaro shorty headers that fit real good and can also bolt up to the fox exhaust. I think because I already have 351 headers that I will most likely take that route. Turbo wise, I find everyone tends to use the stock truck manifolds.
That build will be sick. I’d love to see it in person sometime.