It is the offset of the non-factory intake manifold which caused the interference issue... early V8 Broncos had something which might work?
https://www.ebay.com/itm/1966-77-Factory-Ford-Bronco-Air-cleaner-assembly/283819672879?hash=item4214f8852f:g:qgYAAOSw6rFecqXF
https://www.ebay.com/itm/Early-Ford-Bronco-Air-Cleaner-Breather-1966-To-1976-factory-Original/174237065134?hash=item2891569fae:g:nZEAAOSwQNNeg~Ct
With the ones, above, you might need something like this:
https://www.ebay.com/itm/1966-1977-EARLY-FORD-BRONCO-STAINLESS-STEEL-V8-AIR-CLEANER-BRACKET-BRACE/152940330098?epid=4016361999&hash=item239bf43c72:g:5zkAAOSw2fpaofrM
Thanks David. Interesting find, I haven't seen those. Doubt I would find them in the yards around here and those prices are a little high just to avoid an aftermarket cleaner.