440 low profile roots style manifold

The Blower Shops 250 BB blower is 5.5 inches tall but they do not make a mainifold for a MOPAR , I have a tig welder and access to a Pratt Whitney milling machine .
Seems like alot of work to shave 1.25 in off the height providing I use a 3/4 plate ?
Thank you for your thoughts , its fun to plan