Intake manifold? Modification of the existing is possible. Redrilling the heads has also been done.
Lifters? HT2011 Summit, $3.00 each. Sealed Power are a little more, I don't know where the Summit ones come from.
Look in the parts catalog, if they use the same part number for the AMC engines they're the right ones. But generally all 0.904 lifters produced by the aftermarket will be right, unless you get a really old set.
