Summit and Jegs estimated delivery dates are pretty optimistic. Aluminum supply is very tight. In Edelbrock's case, the extremely high cost of aluminum, energy, and a shortage of labor, have reduced production. Waited
8 months for a pair of heads (460), and I don't believe I'll ever see an intake manifold.
How long will all this last ? I've been told at least 2 years, and probably longer. The cost of aluminum ingot jumped about 65% in 2021, and it's still increasing. Labor costs, Edelbrock was posting job positions in the foundry at $15/hr. , but a person can make about the same at Taco bell. Energy costs everyone faces.
A rep in the performance aftermarket, told me a lot of discussion, on just how much the customer is willing to pay. The price jump will be quite a shock. Higher volume parts will get the attention, some parts will never be produced again, the costs just don't make it reasonable.
I keep telling people, if they can find it used, buy it.