mark
+1y
with the weber carb, you can yank all of that stuff if you please. the 3 pipes going into the exhaust will need to be plugged.
if you're not replacing the carb, don't mess with it. the mazda carb is computer controlled and it relies on those components to function correctly.
you can drive around laying crossmember with all the stock stuff in there, just cut the fenders, lift them up and tie them up. you may need to do some vacuum line extending so you can relocate easier.
if you want to ditch it w/o a weber, suit yourself and see how it runs.