There is little or no difference in pronunciation between my "Boeing" and "bowling", both tend to be [bo:UIN]. I may sometimes make a distinction, but not usually.
I pronounce the /l/ in bowling... Boeing and bowling are definitely distinct for me.
In everyday speech "Boeing" is ["bo:I~:N] while "bowling" is ["bo:UI~:N]. They sound similar but are not truly merged due to the historical shift oU > o here.
I have "Boeing" ["b7U.IN] and "bowling" ["boU5.IN], demonstrating pre-/l/ allophony similar to Reggo's, so the two are very distinct for me.