Nearly any aftermarket manifold swap will require some tweaking, whether using one stock one or replacing both.

The Fentons supposedly use one stock pipe and one custom one. I've never tried it.

Mothertrucker will beat Patrick's price all to heck on the manifolds.

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"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.