The TBI unit and the adapter will bolt up if you have the Holley 2 barrell type plenum on either manifold you mentioned. Howell can supply other adapters if you need them.
You can call Howell and find out for sure. (810) 765-5100
Also make sure you let Howell know of all your engine modifications from intake to headers and all internal parts. This can change the operation of the Howell kit.
I ran that kit on 258 and now run a Howell wiring harness on the 350. They do great work and will help you out the best htey can.
Turbo City sells a GM TBI based fuel injection kit, like Howells, which comes with an Offenhauser intake manifold. The reveiw in Peterson's 4wheel & Off Road said it worked great on the jeep they installed it on.