I just saw it mentioned that a '55 265 left manifold will clear without moving the steering box. This is second hand info,but sounds like it'll work to me. (If you can find 'em,it might be good to go with a set from a '55,just for synchronicity. {balance})
For a bigblock,I think the subframe is a better idea.
Speed


1954 GMC 350
1957 GMC 1/2 ton
1962 Chevy C-30
1952 Chevy 6400 dump bed project truck
'98 Harley FLSTC
'66 Pontiac Catalina
'76 Chevy 1 ton Duallie
'84 Bronco II
'78 Dodge W-200
'81 Toyota 4X4 truck