Not sure what your schedule is but I highly recommend Quadrajet Power- they may have one ready to go on the shelf or be able to build you one to suit your needs.
www.quadrajetpower.com
They rebuilt mine and its been great right out of the box with minimal adjustments needed.
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'51 South Bend Model "9A"
'56 Chevy 3600 NAPCO
'74 Chevy Cheyenne Super K20-restored on 37's
'72 GMC Sierra Custom K2500- in progress
'08 GMC Envoy Denali
'12 GMC Sierra 2500HD Denali
'17 GMC Yukon XL
VCCA member #58596
http://www.nohrco.com