'70 Dart 392 Project; what direction?

While I'm waiting for machine shop to hot tank my block and rods, I'm doing some more research. Currently saving up for the HemiDenny K member kit, but want to get my block and trans buttoned up before purchasing. Still need to purchase holley midmount setup as well as an oilpan/pickup assembly and valvecovers.

Has anyone used these manifolds? I wouldn't mind saving the cash on the headers, and with a R&P steering and coilovers I don't see why these wouldn't work? Any insight?
Jeep Grand Cherokee SRT Exhaust Manifold Kit - 77072462AB

Thanks much.

Mike