Opinion on Clifford mods for Slant 6 motors

Ok, so I'm considering a 74 Dart with an original 225 and 904. This appeals to me because I think this could be a really fun project to go from the ground up. Motor is seized as it was stored with no intake or exhaust manifold for years. Car is going to have to be trailered to even get to me. In the end I believe that the motor is rebuildable.

Clifford says that with the following things I can end up with over 400 foot pounds of torque and 325 HP.

> mill .110 off the cylinder head, port & polish the cylinder head and polish the tops of the valves.
> Install our 270 mechanical cam, springs, retainers and valve locks.
> Bolt on our Weber Twin kit with headers and you will have a minimum of 320 ft lb. of torque.
> Go with .060 pistons and our 270 mechanical cam, you could end up with 400 ft lb. of torque and 325 hp, but we have to use Chrome rings or you will no seal

So their Weber twin kit is basically a dual 2 bbl carb setup and they have headers that'll hook to 2.25" pipes out the back/sides.

So, the million dollar question is, does anybody have experience with Clifford and are their claims mostly accurate? Or is this a big marketing thing and you can get improved performance but nowhere near the numbers they're suggesting?

They're talking around 3 grand without any crank or piston/cylinder work just to get this far, so obviously this could easily be a 5,000 dollar or more motor to get there, but if it does get there, it's a numbers matching slant 6 car that could really perform well.

Thoughts? Advice?