(Mike P: responed this in the other thread I put there by mistake, so. So here's Mike P's respnse in this thread to make things a bit more organized. Sorry for the confusion):

Originally posted by Mike P
This should have likely been started as a separate post as your dealing with a car instead of a PU, but I'll give you my experience in building one of these several years ago for a customer.

For your front end, the Mustang II units work out pretty well, just make sure you get one from a good manufacture, not the cheapest one you can find (my customer went the low ball route, and spent more for me to get it to work right than it would have cost for a properly enginered one). To get the proper spring rate specify 78 Mustang II V8/AC (HD) springs, and if you want to lower it use dropped spindels. I would also recommend also upgrading the brakes from the 9" rotors that come standard in a lot of these kits. A new steering column will need to be added, (we used a generic GM tilt unit).

Motor mount perches were fabricated in house.

For exhaust, standard SB ramshorn manifolds or shorty headers seem to work well.

A TH350 worked well with no tunnel modifications necessary.

A 55-57 Chevy rear end was a bolt in.

Unless your a certified welder or know someone who is getting the front end under the car will likely be the most expensive part of the project but the drivability the new front end gives you will be well worth it.