I was tempted to snag one myself...... just to have it.
But....... I made my own out of a Holley SD in 1990......before the M1 intake even existed.

Shortly after I did this one, the Weiand TG came out, which was also available in a 4500 version.

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68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads