mazdamn
+1y
in pic 4, you can unscrew those 4 fittings, and get pipe plugs that drop right in. At least its what I did to my previous 3 mazdas. The 2 lower I just hacked, smashed, crimped, hammered, then welded them shut.
(after I got a Mr. Gasket 2bbl to 4bbl adapter, and ran a 14" diameter, 2" tall chrome filter, and called it a day.)
old as dirt, but half ass shows it. Also, I believe EACH and EVERY B series should have an electric fan installed. Its GOTTA free 15hp. Seriously.