Depending on what you are going for the swap can be done for far less than any crate type engine, not if you just gotta have the corvette engines. but truck engines are plentiful and cheap and the best part is most of the parts actually do interchange ,save for a few, for instance my 68 has an ls based engine in it actually a 4.8l and I guarantee it gets down the road worlds better than the 327 it came with ever dreamed, swap parts are getting cheaper everyday,.and becoming available,mine has the 4l60e still hooked to it, if you are after all out power get a lq9. And build it however you like, as for cost, I am picky it's my car,and all my labor, so I couldn't say . I have way more time in my ls swap than any of the other ls swaps I have done.but I can turn one out in about three weeks, by myself. Including building the wiring harness too. The biggest issue on your car is the rear steer/ exhaust clearance . I twigged up some long tubes for mine, but I have a set of headers off of ebay that I'm gonna test fit, they r stainless for like 225$ and look top notch, we will see. I'm in tn. If I can help in anyway just drop me a line or you can call or text.423-618-4111 I will help however I can.. I don't need tons of power in my impala it's more of a low rod, the 72 nova is a different story to come.